ML20127A505

Recommends That Surveillance Requirement Item 4.6.1.2.c.1 & c.3 of STS Be Changed.App C to ANSI 451.4-1972 Requires Superimposed Leakage Rate to Be Approx Equivalent to La

ML20127A505
Person / Time
Site:	Columbia, 05000000
Issue date:	03/01/1983
From:	Butler W Office of Nuclear Reactor Regulation
To:	Thomas C Office of Nuclear Reactor Regulation
Shared Package
ML19263A614	List: 05000000/LER-1984-002, :Since 840107,several Instances of Reactor Protection Sys Bus Breaker Trips Resulted in Loss of Shutdown Cooling.Trip on 840119 Caused by Failure of Circuit Board 05000000/LER-1984-010, :on 840210,reactor Protection Sys Motor Generator Set Output Breaker B Tripped While Transferring Power from Alternate Supply.Caused by Voltage Transient. Design Change Being Considered AECM-84-0133, Advises NRC of Completion of Operator Recertification Program,Per 831118 Commitment.Deficiencies in Training That Remain Open Will Be Closed in Near Future.One Licensed Reactor Operator Undergoing Remedial Training AECM-84-0204, Special Rept 84-017/0:on 840304,Fire Doors 1A401 & OC219 Blocked Open to Support Maint Activities.Fire Watches Established Until Doors Restored AECM-84-0226, Responds to 840323 Confirmation of Action Ltr Re Verifying Removal of Certain Individuals from Licensed Duties.Util Has Evaluated Licensed Operators to Determine If Deficiency Identified Applicable to Other Operators.Related Info Encl AECM-84-0239, Provides Info Re Plant Discrepancy Repts to Assure That Any safety-related Hardware or Procedural Deficencies Properly Dispositioned,Per 831205 Confirmatory Action Ltr.Procedural Revs Instituted.Related Info Encl ML19263A613 ML20126D262 ML20126D273 ML20126D322 ML20126D343 ML20126D352 ML20126D357 ML20126D360 ML20126D363 ML20126D376 ML20126D380 ML20126D392 ML20127A505 ML20127B023 ML20127B328 ML20127B331 ML20127B336 ML20127B341 ML20127B347 ML20127B352 ML20127B358 ML20127B363 ML20127B365 ML20127B370 ML20127B373 ML20127B377 ML20127B381 ML20127B384 ML20127B389 ML20127B408 ML20127B440 ML20127B520 ML20127B524 ML20127B530 ML20127B533 ML20127B542 ML20127B803 ML20127B808 ML20127B888 ML20127B893 ML20127B922 ML20127B927
References
FOIA-84-459 NUDOCS 8303090590
Download: ML20127A505 (1)

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..s MAR 1 1533 MEMORANDUM FOR:

C. Thomas, Chi ef Standardization and Special Projects' Branch, DST FRCri:

W. Buti er, Chief Contairenent Systems Branch, DSI SUBJECT :

RECOMMENDED CHANGE TO THE STANDARD TEC'HNICAL SPECIFICATI Sui veillance requirement.4.5.1.2 Item C.1 of the Standard Technical Specifications, which is identical to Iten III.A.3.b of Appendix 0 to 10 CFR Part 50 is not well war.ded since if the -test is properly perfomed, the difference between the supplemental and the Type A tests can never be 4 0.25 La.

Therefore, it-is recommended that Iten 4.6.1.2.c.1 of the Standard Technical Specifications"be changed to read either of the following two ways:

1.

" Confirms the accuracy of the test by ver,ifying that the contair:nent leakage rate, L'v, calculated in accordance witb ANSI N 45.4 -1982, Appendix C, is within '25 percent of the contairenent leakage rate, Lv, measured prior to the introduction of the superimposed leak"; or, 2.

" Confirms the accuracy of the test by verifying that the supplemental test result, Lc, minus the sum of the Type A and the superimposed leak,' Lo, are equal to or less' than

0. 25 La ".

In addition, it is recommended that Item C.3 of the same surveillance re-cuirements be changed to read as follows:

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"RequiresVthe 7 1:', 4 gas injected into th'e containment or bled from the contairrnent during the supplemental test be between 0.75 La and 1.25 La".

The rea son for this change is that Appendix C to ANSI N 45d4 - 1972 requires ANSI /;perimposed leakage rate to be approximately equivalent to La.

the su The new NS 56.8 sets the limits between 0.75 and 1.25 La.

Ey copy of this memorandum, we recommend that these changes be made a part of the Standard Technical Specifications for both BWR's and PWR's.

63$3p9$5fdt/P O4 A

Valter F..

Eutler, Chief Centa in. ant' Systems Era nch' Division cf Systems Integration cc:

R. Mattson R. Houston R. Battimore re - ~ x x-

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