ML20070U991

Application for Proposed Change 114 to License DPR-28 Consisting of Change to Tech Specs to Allow Use of Manual Valve to Effect Primary Containment Isolation

ML20070U991
Person / Time
Site:	Vermont Yankee
Issue date:	02/08/1983
From:	Heider L VERMONT YANKEE NUCLEAR POWER CORP.
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20070U993	List: ML20070U991 ML20070V000
References
FVY-83-8, NUDOCS 8302140114
Download: ML20070U991 (3)

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' VERMONT YANKEE PR P SED CHANGE NO.114 NUCLEAR POWER CORPORATION 2.C.15.1 AD 5 Box 169. Ferry Road, Brattleboro, VT 05301 ,,,Ly,,

ENGINEERING OFFICE h[ February 8, 1983 1671 WORCESTER ROAD FRAMINGHAM. MASSACHUSETTS 01701 TELEPHONE 617-4T2-8100 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Office of Nuclear Reactor Regulation Ref erence s: (a) License No. DPR-28 (Docket No. 50-271)

Subject:

Expedited Technical Specification Change: Primary Containment Isolation Valves

Dear Sir:

PROPOSED CHANGE The change involves a revision of page 135 of the Vermont Yankee Technical Specifications. The revision to page 135 allows the use of a manual valve not currently listed in the Technical Specifications to effect primary containment isolation.

REASON FOR CHANGE On February 3, 1983, V16-20-20 and V-16-20-22B failed to close. The valves were closed af ter several actuations of the remote manual switches.

Based on past experience with these valves, the failure is assumed to be due to a collection of ferrous metal particles collected on the magnet used to provide valve position indication. On February 4, 1983, a Y-strainer with a magnetic insert was installed upstream of the valves to prevent the ferrous metal particles from reaching these valves.

l The existing installation consists of the above mentioned two solenoid l

operated valves in series with a manual globe valve. The globe valve is

installed to provide a boundary for leak testing V16-20-20 and V16-20-22B in accordance with 10CFR50 Appendix J. This change will allow the manual valve l to be used as a containment isolation valve for a period not to exceed 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> during which V16-20-20 and V16-20-22B can be disassembled, cleaned, reassembled, leak tested in accordance with Appen Jix J, and returned to service. During the 1983 Refuel Outage, scheduled to begin March 5, 1983, the solenoid valves would be replaced with a valve of a different design. The installation of the Y-strainer will assure the operability of the valves during the interim period.

This change is required prior to February 15, 1983 in order to prevent a plant shutdown. The subject valves must be opened in order to re-establish d/p in containment after conducting vacuum breaker surveillance testing. A plant shutdown would invoke an additional cycle on the reactor vessel as well

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l as expenditures of approximately $750,000 per day for replacement power during the shutdown.

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8302140114 830208 PDRADOCK05000g l P

United States Nuclear Rigulatory Commission February 8, 1983

' Attention: Office of Nuclear Reactor Reguaation Page 2 SAFETY CONSIDERATIONS V16-20-20 and_V16-20-22B are closed at the present time thereby satisfying the safety aspect of primary containment. In order to return these valves to service without a plant shutdown, manual globe valve V-16-20-22D.would be used to maintain primary containment integrity during the repair process. Although V16-20-22D is not presently listed in Vermont Yankee Technical Specifications, we believe its use as an isolation valve is acceptable for the following reasons:

1. The manual valve is properly designed for temperature and pressure conditions.

2. The manual valve would be used only once for a period not to-exceed 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> during the repair of V-16-20-20 and V16-22-22B. The normal repair time for these valves is 8 to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

. 3. The manual valve has been subjected to a leak test in accordance with 10CFR50 Appendix J.

The last successful test was performed January 9, 1983.

10CFR50 Appendix J states that a Type C test shall be performed by local pressurization. The pressure shall be applied in the same direction as that when the valve would be required to perform its safety function, unless it can i be determined that the results from the tests for a pressure applied in a different direction will provide equivalent or more conservative results.

i l l V16-20-22D is the boundary valve for leak testing the two solenoid i

valves. When applying the test pressure, V16-20-22D is tested in a direction opposite that which the valve would be required to perform its safety '

func tion. In order to verify that the test is equivalent regardless of the direction that the pressure is applied, an identical valve was tested on February 4, 1983, in both directions. After repeating this test several i times, it was concluded that there was no discernable difference in leakage rate when applying pressure under the seat or over the seat of this one inch manual globe valve. This test was witnessed by the Resident NRC Inspector.

The maximum Icakage in either direction was 0.014 lbm/hr.

I Based on the above, the probability of previously evaluated accidents is not increased by this change. The possibility of a different type of accident is not created nor are the margins of safety as defined in the _ basis of the 'l Technical Specification reduced by this proposed change. Therefore,-this ,

change does not constitute an unreviewed safety question as defined in I 10CFR50.59(a )(2).

This submittal has been reviewed by the Vermont Yankee Safety Audit and i Review Committee.

FEE DETERMINATION This proposed change requires an approval that involve a single safety issue and is deemed not to involve a significant hazards consideration. For these reasons, Vermont Yankee Nuclear Power Corporation proposes this as a Class III Amendment. A payment of $4,000.00 will be forwarded.

1

,United States Nuclezr R:gulatory Commission February 8, 1983 Attention: Office of Nuclear Reactor Regulation Page 3 SCHEDULE OF CHANGE This proposed change will be incorporated into Vermont Yankee Technical Specification as soon as possible following NRC approval.

We trust that yott will find this information satisfactory; however, should you desire any additional information, please contact us.

Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION p f lldS U L. H. Heider Vice President LHH/dd COMM0hWEALTH OF MASSACHUSETTS)

)ss MIDDLESEX COUNTY )

Then personally appeared before me, L. H. Heider, who, being duly sworn, did state that he is a Vice President of Vermont Yankee Nuclear Power Corporation, that he is duly authorized to execute and file the foregoing request in the name and on the behalf of Vermont Yankee Nuclear Power Corporation and that the statements therein are true to the best of his knowledge and belief.

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(/ B. Sinclair Notary Public My Commission Expires June 1, 1984

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