ML19259B339

LER 78-080/03X-1 on 780914:noted That Valves in Pressure Suppression Chamber to Drywell Vacuum Breakers Were Never Subjected to Local Leak Rate Tests.Testing Will Be Completed During Refueling Outage Begun on 780916

ML19259B339
Person / Time
Site:	FitzPatrick
Issue date:	01/22/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19259B332	List: ML19259B330 ML19259B339
References
LER-78-080-03X, LER-78-80-3X, NUDOCS 7901260188
Download: ML19259B339 (2)

Text

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ATTAClistENT TO LER-78-080/03X-1 Page 1 of 1 During normal operation, while reviewing a draft of the Primary Containment Integrated Leak Rate Test to be performed during the month of November,1978, it was noted that the pressure suppression chamber to drywell vacuum breakers (valve 27-VB-1 through 27-VB-5) have resilient seals on the valve covers (bonnets) and both ends of the operating shafts. Investigation indicates that these seals have not been subjected to " Type B" local Icak rate tests (LLRT) as required by Technical Specification, Appendix A, Paragraph 4.7. A.2.d.2. The valve operating shaft seals and bonnet seals are "0" rings similar to those used on the CRD removal hatch and the equipment hatch and should be subjected to similar tests at the same frequency to provide assurance that the sealing materials can withstand accident pressures and that leakage remains acceptably low.

As soon as practical, following discovery of the missed surveillance, the valve bonnets and operating shaft seals were tested with " snoop" Icak detecting fluid with the drywell inerted with nitrogen at 18.0 psia and no leakage was found. The valves have been added to the LLitT schedule and the testing will be completed during the refueling outage that began on September 16, 1978.

LLRT of the referenced valves was conducted during the 1978 Refueling Out-age and revealed the following with respect to leakage of these valves.

VALVE , DATE TESTED LEAKAGE AT 60.0 PSIA (SCFD)*

27-VB-1 10/ 5/78 14.5 27-VB-2 10/ 5/78 7.8 27-VB-3 10/ 5/78 90.6 27-VB-4 10/ 5/78 427.56 27-VB-5 10/ 5/78 81.44 As a result of the above indicated leakage, work requests were written to replace the 0 ring seals on both ends of the operating shaft on 27-VB-3, 4, and 5. Following completion of the repairs the LLRT was repeated with the following results.

VALVE DATE TESTED LEAKAGE OF 60.0 PSIA (SCFD)*

27-VB-3 10-21-79 40.8 27-VB-4 10-21-79 1.02 27-VB-5 10- 9-79 12.83

• Combined leakage of valve bonnet and both ends of the operating shaft.

NOTE: This LER is updated to report repairs and test data. In addition, Items 9 and 17 on the LER form are revised.