ML20117P442

Application for Amend to License NPF-29,changing Containment Purge Valves W/Resilient Seals on Performance Based Leakage Testing Frequency

ML20117P442
Person / Time
Site:	Grand Gulf
Issue date:	09/19/1996
From:	Hagan J ENTERGY OPERATIONS, INC.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20117P444	List: ML20117P442 ML20117P446
References
GNRO-96-00108, GNRO-96-108, NUDOCS 9609230276
Download: ML20117P442 (4)

Text

'

- O

= Entcrgy 22=*"* '"*-

Operations ggg=

September 19, 1996 U.S. Nuclear Regulatory Commission Mail Station P1-37 Washington, D.C. 20555 Attention: Document Control Desk

Subject:

Grand Gulf Nuclear Station Docket No. 50-416 License No. NPF-29 Purge Valve Testing Revision to Proposed Amendment to the Operating License (PCOL-96/051)

GNRO-96/00108 Gentlemen:

Entergy Operations, Inc. is submitting by this letter a revision to a proposed amendment to the Grand Gulf Nuclear Station (GGNS) Operating License. By letter dated May 5,1996, we requested a change that would put containment purge valves with resilient seals on a performance based leakage testing frequency. We requested that these valves be tested in accordance with our Appendix J testing program. The proposed change would affect Operating License Surveillance Requirement (SR) 3.6.1.3.5.

On September 11,1996, in a conference call, the staff stated that they believed that the data available supported a maximum interval of 36 months. In addition, we were informed that all the purge valves must be tested within 92 days if any purge valve fails to meet it's acceptance criteria and that a staggered testing interval would be required.

A staggered test interval is currently required by our Appendix J leak rate testing program. A portion of each of the components on extended testing intervels are tested each outage to assist in identifying common mode failures. This l establishes what amounts to a sampling program for these valves. This staggered testing helps to ensure that problems associated with valves of similar design, age or usage are identified on a reasonable frequency. In addition, a review is performed on each failure to determine if the failure is generic or l isolated. If it is determined that the failure is generic, all other components that 9609230276 960919 /

PDR ADOCM 05000416 P PDR

l September 19, 1996 GNRO-96/00108 Page 2 of 4  !

are subject to the same failure mechanism are adjusted to an appropriate interval.  !

During our discussions, we agreed to reword a portion of the proposed change to implement the prescribed changes. Attachment 1 is the oath and affirmation required by 10 CFR 50.30. Attachment 2 provides a revision to " Insert 3.6-15A" and " Insert B 3.6-24A" from our original submittal, as well as a revised mark-up of the Bases. The no significant hazards considerations included in the original propasal also applies to this revision and is therefore not included here.

Yours truly, J. J. Hagan Vice President, erations GGNS JJH/WBB/ams attachments: 1. Affirmation per 10 CFR 50.30

2. Revised Marked-up Pages To The GGNS Operating License cc: (See Next Page) i I

i l

1 l

i

, t, j BEFORE THE

' ~

f. UNITED STATES NUCLEAR REGULATORY COMMISSION

j. LICENSE NO NPF-29 i

!' DOCKET NO. 50-416 i

4 l lN THE MATTER OF f MISSISSIPPI POWER & LIGHT COMPANY and  !

SYSTEM ENERGY RESOURCES, INC. l

and l

SOUTH MISSISSIPPI ELECTRIC POWER ASSOCIATION

-and i ENTERGY OPERATIONS, INC.

l l

, AFFIRMATION I,'J. J. Hagan, being duly sworn, state that I am Vice President, Operations GGNS of Entergy Operations, Inc.; that on behalf of Entergy Operations, Inc., System Energy Resources, Inc.,

and South Mississippi Electric Power Association I am authorized by Entergy Operations, Inc. to i sign and file with the Nuclear Regulatory Commission, this application for amendment of the l Operating License of the Grand Gulf Nuclear Station; that I signed this application as Vice

?

President, Operations GGNS of Entergy Operations, Inc.; and that the statements made and -

.the matters set forth therein are true and correct to the best of m knowledge, information and

belier.

i f

/J . Had an i STATE OF MISSISSIPPI COUNTY OF CLA! BORNE SUBSCRIBED AND SWORN TO before me, a Notary Public, in and for the County and State i above narned,' this /9

• day of Scera-e .1996.  ;

(SEAL) -

e

~

. Notary Pu6lic My commission expires:

f*'*IO"?! $7ATEWIDE NOTAM Pl.

I l COMM251 E:"K.20 JAF:. 2000 27, 'BUC

.JDD TE.J STECA'.1 NOTCY SERVG I

______.7 . _

7.. ,

l Insert 3.6-15A

'36 mohths with at least 2 pairs of valves tested every 18 months  !

AND i I

-note -.-

l SR 3.0.2 is not applicable in Accordance with 10 CFR 50, Appendix J, as modified by approved exemptions AND

--note Not applicable to valves i tested within 92 days prior i to any purge valve failing to meet it's acceptance criteria Once within 92 days, test all remaining purge valves, if any purge valve fails to meet it's acceptance criteria insert B 3.6-24A ,

1 l

36 months, with consideration given to operational experience and safety significance. ,

Additionally, this SR must be performed for all purge valves within 92 days following any  !

purge valve failing to meet it's acceptance criteria. This ensures that any common mode i seal degradation is identified. I The Fre'quency for this SR is modified by two notes. The first note indicates that SR 3.0.2 is I only applicable to the "36 month" statement in the frequency. The second note indicates that  !

all valves do not have to be retested due to the failure of another valve, provided they have been tested within 92 days prior to any valve failing to meet it's acceptance criteria.

i i

I 1

_ - _ . . . ,