Basically Gov Cuomo notified his citizens on March 29 of this. The outage began March 7. Isn't my complaint perfectly timed. The NRC's responce is dated March 25 and the baffle bolt problem emerged on March 29.
Indian Point nuclear power plant shutdown after inspectors discover
'missing' bolts from reactor
NEW YORK DAILY NEWS
Wednesday, March 30, 2016, 11:04 PM
The Indian Point nuclear power
plant will stay shut after inspectors discovered that more than 200 stainless
steel bolts were “faulty” or “missing” from a reactor, officials said.
Entergy Corp., which runs the
facility north of New York City, said there was no threat to public safety or
health.
Operators had already shut down
the plant for a planned outage. They said the bolt setback will keep the site
offline for several more weeks.
Gov. Cuomo said the issue was the
latest in a series of incidents that raises concerns about the plant’s
management, a sentiment echoed by U.S. Rep. Nita Lowery (D-Westchester).
“If we can’t trust that the bolts
that hold the reactors together are secure, how can we trust that the plant is
safe and secure?” she said in a statement.
“It’s too dangerous for Entergy
to let maintenance fall behind at this nuclear facility that is situated in the
middle of the most densely populated area of the country just miles from New
York City.”
Runaway Main Steam Safety Valves (MSSV)Tech Spec Lift Settings
I think the magnitude of the failures at Indian Point sits outside the experiences of any other plant in the USA. There are other manufacturers supplying similar valves to other plants who never report and tech spec failures.
It will be interesting this outage if more MSSVs are failed according to tech specs.
He never answered why the failures ramped up in 2009? These is massively defective maintenence and a defective design.
I got to give great credit to the NRC with answering me, more important putting it on the docket for everyone to see.
March 25,
2016
Mr. Michael Mulligan
P.O. Box 161
Hinsdale, NH 03451
Dear Mr. Mulligan:
This letter is in response to your
letter dated February 4, 2016, to Mr. Victor M. Mccree, Executive Director for
Operations, of the U.S. Nuclear Regulatory Commission (NRC), regarding main
steam safety valve (MSSV) failures at both the Indian Point and Shearon Harris
nuclear power plant facilities. Your letter addresses multiple licensee event
reports (LERs) where surveillance testing identified that the lift settings of
MSSVs were found to be outside of the technical specification (TS) allowed
tolerance. Your letter asserts that there has been an unexplained increase in
the number of MSSVs failures due to setpoint drift since 2009 and that NRC
generic communications on this subject are out-of-date and nonresponsive to your
perceived industry trends. Specifically, you requested that your concerns be
reviewed pursuant to Title 10 of the Code of Federal Regulations (10
CFR), Section 2.206, "Requests for action under this subpart," and
the following actions be taken:
- Perform an immediate special
inspection of MSSV failures at Indian Point;
- Issue a new NRC Information Notice on
MSSV failures; and
- Require that Indian Point immediately
eradicate any problems associated with MSSVs up to, and including, a plant
shutdown.
The NRC staff has reviewed your letter
against the criteria of NRC Management Directive 8.11, "Review Process for
10 CFR 2.206 Petitions" (Agencywide Documents Access and Management System
(ADAMS) Accession No. ML041770328), and concludes that it does not meet the
threshold for review under 10 CFR 2.206 because the issues you raised have
already been the subject of staff review and have been resolved. Therefore, the
staff rejects your request to review your letter pursuant to 10 CFR 2.206.
Since your letter focused on Indian
Point, the following discussion is based upon the Indian
Point plant design, the LERs identified
in your letter, and the associated NRC staff review.
Steam Generator Safety Relief Valves
Each Indian Point unit has 5 safety
relief valves installed on piping connected to each of the 4 steam generators.
Therefore, there are 20 relief valves to remove steam from the generators during
a plant accident or transient event. These valves are installed in a high
pressure, high temperature and high vibration (due to steam flow) environment.
As a result, testing and adequate maintenance are required to ensure the
operability of the valves.
The design of the valves ensures that
the steam system, including the secondary side of the steam generators,
transient maximum pressure does not exceed 110 percent of the system design
pressure during accident or transient events. This is the standard requirement
for relief regulations in 10 CFR 50.55a require following the ASME
Code. For Indian Point, the system design pressure is 1170.5 pounds per square
inch gauge (psig), resulting in a maximum transient pressure of 1287 psig.
Additionally, the relief valves are designed, such that, they together have the
capacity to relieve 108 percent of design steam flow, which exceeds the design
limit of 102 percent steam flow relief capacity assumed in the plant's safety
analysis. Indian Point steam generator relief valves are nominally set at 1065,
1080, 1095, 1110 and 1120 psig. Valves are set at different pressures to
prevent rapid cycling that could occur if multiple valves opened at the same
time. The TSs at Indian Point and the ASME Code require that, when the valves
are placed in service, they are set within +/- 1 percent of these values.
After the valves are in service, they
are required to be tested per the ASME Code requirement.The "as found" test limit
of+/- 3 percent for each valve, is listed in the TSs, and is an ASME Code requirement. Valves that are found
to be outside of this limit are required to be declared inoperable and
corrective actions taken to restore them to an operable status. The maximum allowed
"as found" + 3 percent limit is 1153.6 psig.
Test Results
A review of the test results discussed
in LE Rs 2009-002 (Unit 3), 2010-002 (Unit 2), 2011-004 (Unit 3), 2012-005 (Unit 2) and 2015-002
(Unit 3) for Indian Point found that there was no safety impact as a result of
the MSSV failures. In all cases, although the valves failed the acceptance criteria,
all of the valves lifted below the system design pressure limit of 1170.5 psig
and well below the transient design limit of 1287 psig. Additionally, in all
cases adequate steam relief capacity was maintained.
Corrective Actions
The ASME Code and NRC regulations
require that test failures be evaluated and corrective actions taken to address
degraded conditions. Entergy Nuclear Operations, Inc., the licensee, has taken
multiple short and long term corrective actions to address the failures
including:
- • Immediate valve disassembly and
inspection, expansion of testing to include valves not initially scheduled for
testing, and resetting valve setpoints to within +/- 1 percent tolerances.
- Changed preventive maintenance valve
overhaul schedules were changed from an 8-year to a 6-year periodicity.
- Changed Unit 3 testing interval so
that all valves are tested every 2 years (previously 4 years testing
requirement) until modifications are completed. Completed modifications to 7 of
the 20 valves.
- Finally, development and
implementation of permanent design modifications including installing bronze
wear sleeves to limit spindle wear.
Summary
The test data was reviewed and the NRC
staff concludes there is no safety concern related to the performance of the
MSSVs. Based on the test results, the staff determined the valves would have
operated such that the design pressure of the main steam system would not have been
exceeded.
The NRC staff has reviewed each of these
failures and associated corrective actions as part of the reactor oversight
baseline inspection program. Each LER was reviewed and in some cases NRC
enforcement action was taken. Licensee identified violations are discussed in
inspection reports dated May 11, 2010 (ADAMS Accession No. ML 101310350),
August 23, 2010 (ADAMS Accession No. ML 102240597), and August 9, 2011 (ADAMS
Accession No. ML 112212055). Severity Level IV violations are discussed in
inspection reports dated August 9, 2012 (ADAMS Accession No. ML 12222A131) and
August 7, 2015 (ADAMS Accession No. ML 15222A186). Finally, a non-cited
violation is discussed in the inspection dated August 7, 2015 cited above. Corrective
actions performed or scheduled by the licensee were found to be acceptable.
If you have any questions, please feel
free to contact Douglas Pickett at (301) 415-1364 or by e-mail at Douglas.Pickett@nrc.gov.