AECM-82-479, Final Deficiency Rept Re Extensive Internal Corrosion of Dikkers Safety Relief Valve Actuators.Initially Reported on 820521.Actuators Cleaned,Refurbished,Tested & Returned to Original Design Condition.Also Reported Per Part 21

Final Deficiency Rept Re Extensive Internal Corrosion of Dikkers Safety Relief Valve Actuators.Initially Reported on 820521.Actuators Cleaned,Refurbished,Tested & Returned to Original Design Condition.Also Reported Per Part 21

ML20065Q232
Person / Time
Site:	Grand Gulf
Issue date:	10/18/1982
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-82-479, NUDOCS 8210260513
Download: ML20065Q232 (5)

Text

b Nt _c MISSISSIPPI POWER & LIGHT COMPANY

] Helping Build Mississippi munamandes P. O. B OX 1840, J AC K S O N, MIS SIS SIP PI 3 9 2 05 October 18, 1982 JAMES P. McGAUGHY. JR.

ASSISTANT VICE PRESsDENT Of fice of Inspection & Enforcement U. S. Nuclear Regulatory Commission a Region II N

• c 101 Marietta Street, N.W. g Suite 3100 --e G .;;

Atlanta, Georgia 30303 N

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Attention: Mr. J. P. O'Reilly, Regional Administrator > 3 ;n (c

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Dear Mr. O'Reilly:

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SUBJECT:

Grand Gulf Nuclear StatDih ,..

Units 1 and 2 Docket No. 50-416 License No. NPF-13 -

File 0260/15525/15526 -

PRD-82/29, Final Report, Dikkers SRV Actuator Corrosion AECM-82/479

Reference:

AECM-82/283, 6/21/82 AECM-82/359, 8/20/82 On May 21, 1982, Mississippi Power & Light Company notified Mr. R.

Butcher, of your of fice, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction t .t e . The deficiency concerns extensive internal corrosion of Dikkers safety relief valve actuators.

As previously reported, MP&L has determined that this deficiency is reportable under the provisions of 10CFR50.55(e). We have also determined that it is reportable under the provisions of 10CFR21.

Details of the resolution of this deficiency are provided in our attached Final R4 port. This report was originally due on October 15, 1982, but a one I day exte:.sion was granted on that day by Mr. R. Butcher.

Yours trul ,

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KDS:dr ATTACHMEE cc: See page 2 8210260513 821018

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8 PDR ADDCK 05000416 S PDR f 'f j U-Member Middle South Utilities System /

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Mr. J. P. O'Reilly AECM-82/479 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. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association ,

P. O. Box 1589 Hattiesburg, MS 39401 l

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9 ,. Attschment to AECM-82/479 PIga 1 cf 3 FINAL' REPORT FOR PRD-82/29

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

J. P. McGaughy, 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 II, by phone on October 13, 1982.

2. Identification of the facility which contains a deficiency:

Grand Gulf Nuclear Station (GGNS) Units 1 and 2 Port Gibson, Mississippi 39150

3. Identification of the firm supplying the basic component which contains a deficiency:

Supplied to Grand Gulf by General Electric Company, San Jose, California.

It is indeterminate if the actuators and valves were defective when they were supplied or if the corrosion occurred af ter receipt by MP&L.

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

A. Description of the Deficiency Extensive internal corrosion was discovered upon disassembly of a Dikkers main steam line safety relief valve (SRV) during routine maintenance. Six (6) of twenty (20) installed actuators were found to be internally cor-roded upon subsequent inspection. In addition, corrosion was found in both Unit I spare actuators (actuators only, not complete SRV assemblies),

actuators on six (6) of eight (8) spare SRVs for Unit 1 and one (1) of eight (8) Unit 2 SRVs inspected. Corrosion was present on the springs, studs, piston plate, top and bottom cover plates, and the spring retainer cover. All of the corroded parts were galvanized steel.

B. Analysis of Safety Implications The relief f unction of the SRV's is af fected. The SRV's are a portion of the nuclear boiler system and eight (8) of them form a portion of the Automatic Depressurization System ( ADS). The Low Pressure Core Spray (LPCS) and Low Pressure Qaolant Injection (LPCI) Emergency Oare Oaoling Systems depend upon the ADS for depressurization prior to initiation. A failure of the SRV actuators could result in insuf ficient emer ;ency cool-ing under severe transient conditions and af fect core integrity.

Q ,, Attschment' to AECH-82/479 P ge 2 cf 3

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

Mississippi Power and Light received information of the deficiency on May 21, 1982. We reported the deficiency to Mr. R. Butcher, of your office, as a Potentially Reportable Deficiency on that date. Since then MP&L has filed two (2) Interim Reports to inform the Commission of the progress and status of the evaluation of this deficiency. An evaluation for Part 21 has been completed and the MP&L " Responsible Of ficer," Mr. J. P. McGaughy, Jr., will be notified when he returns to his office.

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

There are a total of fif ty (50) actuators for the Dikkers safety relief valves on Unit 1 and Unit 2 at Grand Gulf. Thirty-eight (38) of these valves have been inspected to date. Of these, fif teen (15) have been found corroded. An

. additional twelve (12) Unit 2 SRV actuators have not been inspected. These will be inspected prior to being installed in Unit 2.

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

7. The corrective action which has been taken the name of the individual respons-ible for the action; and the length of time that has been taken to complete the action.

A. Corrective Actions Taken The six (6) installed Unit 1 actuators were replaced with Unit I and Unit 2 spare actuators.

The fif teen (15) actuators that were corroded have been cleaned, refur-bished, tested, and returned to their original design condition.

The Unit 2 actuators that have not been inspected will be inspected prior to installation in Unit 2.

B. Responsible Individual Unit 1 Unit 2 C. K. Mc Cby T. H. Cloninger Nuclear Plant Manager Unit 2 Project Manager Mississippi Power & Light 00. Mississippi Power & Light Co.

i C. Length of Time to Complete Actions Mississippi Power & Light Company was first aware of the deficiency on May 21, 1982. All corrective actions for Unit I have been completed.

The remaining twelve (12) Unit 2 SRV actuators will be inspected prior to installation.

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Attichment to AE0f-82/479 P2ge 3 cf 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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