ML20052G354

Final Deficiency Rept Re Outboard Subsystem Process Line Layout of MSIV Leakage Control Sys,Initially Reported 820422.Subsystem Rerouted.Also Reported Per Part 21

ML20052G354
Person / Time
Site:	Grand Gulf
Issue date:	05/03/1982
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, AECM-82-200, NUDOCS 8205180285
Download: ML20052G354 (5)

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< , ~ c, MISSISSIPPI POWER & LIGHT COMPANN % '

Helping Build Mississippi ' ?p, P. O. B O X 16 4 0. J A C K S O N , MISSISSIPPfSp205 l

'l y amts e wcaucsy.an May 3, 1982 ~ 88 A%f t' A% f V6CE Pf4 StfA NT Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II 101 Ma rietta Street , N.W.

Suite 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator Dea r Mr. O' Reilly:

SUllJECT: Grand Gulf Nuclear Station Unit 1 Docke t No. 50-416 File 0260/15525/15526 PRD-82/16, Final Report, MSIV Leakage Control System AECM-82/200 On April 2, 1982, Mississippi Power & Light Company notified Mr. A.

Ilardin, of yotw of fice, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns the outboard sub-system process line layout of the Main Steam Isolation Valve (MSIV) Leakage Control System (MSIV-LCS) (E32) in Unit 1.

We have evaluated this deficiency and have determined that it is a substantial safety hazard and is reportable under the provisions of 10CFR50.55(e) and 10CFR21 for Unit 1. Reportability under the provisions of 10CFR21 was reported by telephone to Mr. R. Butcher on April 22, 1982.

The required modifications have now been completed in the E32 System and General Electric will revise the design specification, in accordance with MP&L recommendations, to prevent recurrence of the problem in Unit 2.

Ou r Fina l Repo r t is included as Attachment A.

Yours truly, f tl h'&

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RDC:d r ATTACHMENT cc: See page 2

,%ElAL COPY 8205180d%f3 Y Member Middle South Utilities System j

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Mr. J. P. O'Reilly AECM-82/200 NRC Page 2 cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Richard C. DeYoung, Director Office of Inspection & Enforcement U. S. Nuclea r Regulatory Commission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 llattiesburg, MS 39401 l

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r Attachinent "A" to AECM-82/200  ;

Page 1 of 3 I c FINAL REPORT TO PRD-82/16

1. Name and address of the individual ... informing the commission:

J. P. McGaugby, Jr.

Assistant Vice-President, Nuclear Production P.O. Box 1640 Jackson, Mississippi 39205 Notification of Part 21 applicability made to Mr. R. Butcher, NRC, Region Il by telephone on April 22, 1982, by MP&L.

2. identification of the facility ... which ... contains a deficiency:

Grand Gulf Nuclear Station (GGNS) Unit 1 Port Gibson, Mississippi 39150

3. Identification of the firm ... supplying the basic component which ...

contains a deficiency:

The design specification, which implied that the the depressurization line piping have a downward slope to avoid water pockets, but did not specifically call for it, was supplied by the Cencral Electric Corporation in San Jose, California.

4. Nature of the deficiency ... and the safety hazard which ... could be created by such a deficiency ...:

A. Description of the Deficiency The deficiency concerns the outboard sub-system process line layout of the Main Steam Isolation Valve (MSlV) Leakage Control System (MSlV-LCS) (E32) in Unit I. The General Electric Design Specifica-tion 22A4674 implies that the depressurization line piping have a downward slope to avoid water pockets, however, it does not specif-ically call for it. A section of the depressurization line was installed, by Bechtel, with an upward vertical slope for a distance of approximately seven (7) feet.

B. Analysis of Safety Implications During a postulated accident condition wherein the system would be required to operate, the static head of the condensate in the upward slope portion of the line could prevent the leakage control system from functioning. This would prevent the intended depressurization of the main steam lines to near atmospheric pressure.

. , Attacheent "A" to AECM-82/200 Page 2 of 3 If the HSIV-LCS were not operational during a postulated accident condition, the off-site dose rates might exceed the guidelines of 10CFR100.

5. The date on which the information of such deficiency ... was obtained.

Mississippi Power and Light received information of the deficiency on April 2, 1982. We reported the deficiency to Mr. A. Hardin, of your of fice, as a Potentially Reportable Deficiency on that date and to Mr. R.

Butcher as reportable under 10CFR21 on April 22, 1982. An evaluation for Part 21 has been completed and the MP&L " Responsible Of ficer," Mr. J. P.

McCaughy, Jr. , has been notified.

6. In the case of the basic component .. . the number and location of all such components.

. We do not have knowledge of the location of defective equipment located other than at CGNS.

7. The corrective action which has been taken ... the name of the individual

. . . responsible for the action; and the length of time that has been . . .

taken to complete the action.

A. Corrective Actions Taken The outboard subsystem process line has been rerouted so that it does not contain an upward slope and terminates in an area which is serviced by tne Standby Gas Treatment System.

A walkdown of all the process piping in the E32 System was pe rf o rmed. All piping was found to have the proper slope with the exception of the described outboard depressurization piping, which, as stated above, has been corrected.

B. Responsible Individual G. B. Rogers, Jr. _

Site Shnager Mississippi Power and Light Company C. Length of Time to Complete Actions Mississippi Power & Light received information of the deficiency on April 2,- 1982.

All rerouting of depressurization piping has been completed and General Electric will revise the design specification, to assist in preventing recurrence of the problem in Unit 2.

Attachoent "A" to AECM-82/200 Page 3 of 3

8. Any advice related to the deficiency ... that has been, is being, or will be given to purchasers or licensees:

As the deficiency did not originate with MP&L, we have no advice to offer.

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