ML20064L511

Responds to NRC Re Violations Noted in IE Insp Rept 50-370/82-27.Evaluation Performed to Determine Effect of Outgassing of Trapped Air on Test Results.No Corrective Actions Necessary

ML20064L511
Person / Time
Site:	Mcguire
Issue date:	12/03/1982
From:	Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20064L495	List: ML20064L511
References
NUDOCS 8302150295
Download: ML20064L511 (2)

Text

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.y DUKE POWER COMPN P.O. HOX f*A3189.

U' CHARLOTTE. N.C. 28242 HAL B. TUCKER TELEPHONE nm. 5 gL no* a==

December 3,1982) 0f C l

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/ Mr. James P. O'Reilly, Regional Administrator i

U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 i

Atlanta, Georgia 30303

Subject:

McGuire Nuclear Station Docket No. 50-370

Reference:

RII:PRB 50-370/82-27

Dear Mr. O'Reilly:

Please find attached a response to Deviation Item 50-370/82-27-01 which was identified in IE Inspection Report 50-370/82-27. Duke Power Company does not consider any information contained in this report to be proprietary.

Very truly yours, l

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Hal B. Tucker WHM/php Attachment cc: Senior Resident Inspector McGuire Nuclear Station l

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8302150295 830125 PDR ADOCK 05000370 0

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DUKE POWER COMPANY MCGUIRE NUCLEAR STATION Response to IE Inspection Report 50-370/82-27 Deviation Item 50-370/82-27-01 American National Standard, " Containment System Leakage Testing Requirements (ANSI /ANS 56.8 - 1981)," paragraph 5.2.1 states that:

"If the containment structural integrity test above Pac precedes the containment leakage rate test, the pressure shall be reduced to less than 85% Pac for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to repressurizing to Pac for the leakage rate test."

Contrary to the above, after performance of the structural intagrity test at 31.31 psia on September 25, 1982, the licensee reduced the pressure to Pac (29.42 psla) to perform the containment leakage rate test without going below Pac for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to allow for outgassing of trapped air. Further, the licensee had not performed a quantitative evaluation to determine what effect outgassing of trapped air would have on leakage rate test results.

Response

Duke Power Company agrees that after performance of the structural integrity test, die pressure on Unit 2 was reduced to Pac to perform the Integrated Leak Rate Test (ILRT) without going below Pac for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to allow for outgassing of trapped air.

The procedure of lowering pressure to allow for outgassing is recommended in industry standard, ANSI /ANS 56.8, 1981. Duke Power Company does not feel that the above recommended standard is appropriate to apply to McGuire Nuclear Station and it has not been committed to, therefore, no deviation occurred. The ILRT procedure has previously been reviewed by the NRC and no changes were required. The Unit 1 and Unit 2 procedures for this test are identical and agree with the Test ADstract in Chapter 14 of the McGuire Nuclear Station Final Safety Analysis Report.

An evaluation was performed to determine what effect the outgassing of trapped air would have on the test results. The evaluation determined that due to the time lapse between the structu a1 integrity test and the time that data was taken for the ILRT, there was time for outgassing to occur and therefore out-gassing had no effect on the test results. No corrective actions have been deemed necessary.

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