AECM-83-0596, Final Deficiency Rept for Unit 1 & Interim Deficiency Rept for Unit 2 Re Asco Spare Parts Kits for Scram Pilot Valve Solenoids.Initially Reported on 830804.Valves Reworked.Next Rept by 840224.Also Reportable Per Part 21 for Unit 1

Final Deficiency Rept for Unit 1 & Interim Deficiency Rept for Unit 2 Re Asco Spare Parts Kits for Scram Pilot Valve Solenoids.Initially Reported on 830804.Valves Reworked.Next Rept by 840224.Also Reportable Per Part 21 for Unit 1

ML20080H486
Person / Time
Site:	Grand Gulf
Issue date:	09/16/1983
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-83 AECM-83-0596, AECM-83-596, NUDOCS 8309210361
Download: ML20080H486 (5)

Text

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7 MISSISSIPPI POWER & LIGHT COMPANY l Helping Build Mississippi P. O. B O X 16 4 0, J A C K S O N, 205 M September ISSIS 16,S I P PIWEP l9 1983 A Ol gg J AMES P. McGAUGHY. JR.

vecs passione, Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.

Suite 2900 Atlanta, Georgia 30203 At tention: Mr. J. P. O'Reilly , Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket No. 50-416/417 License No. NPF-13 File 0260/15525/15526/16694.4 PRD-83/10, Final Report for Unit 1, Interim Report for Unit 2, ASCO Spare Parts Kits for Scram Pilot Valve Solenoids AECM-83/0596

References:

AECM-83/0445 AECM-83/0561 [

On August 4,1983, Mississippi Power & Light Company notified Mr. Paul Fredrickson, of your of fice, of a Reportable Deficiency at the Grand Gulf Nuclear Station (GGNS) which MP&L has evaluated and determined to reportable under the provisions of 10CFR21 for Unit 1. The deficiency concerns the receipt of improperly assembled ASCO spare parts kits for the "A" solenoid side of the scram -lot valves.

During the testing of the scram pilot valves, as delineated in reference 1),

subsequent to refurbishment, three (3) valves were not operating properly. Investi-gation revealed that a brass plug in the valve body end of the "B" core assembly in the scram pilot valve had been improperly drilled which resulted in the improper seating of the valve stem. This matter, also determined to be reportable under the provisions of ICCFR21 by MP&L, was reported to Ms. L. Watson, of your of fice, on September 16, 1983.

it. remains indeterminate, at this time, as to whether this deficiency is applicable to Unit 2. Attached is MP&L's Final Report for Unit 1, and as per reference 2), MP&L expects to submit a Final Report for Unit 2 by February 24, 1984.

l'ours truly,

?

MW l

J. P. McGaughy, Jr. f()VyiCL c f ACP:dr L p cc: See page 2 /d 8309210361 830916 PDR ADOCK 05000416 ember Middle South Utilities System lj}

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.o4 hsse a m Mr. J. P. O'Reilly ABCM-83/0596 NRC Page 2 cc: Mr . J . B . ' Richa rd Mr. R. B. McGehee Mr. T. B. Conner Mr. Richard C. DeYoung, Director '

Office of Inspection & Eriforcement

~ U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. El ectric Power Association P. O. Box 1589 Hattiesburg, MS 39401

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Attachment to AECM-83/0590 Page 1 of 3 FINAL REPORT UNIT 1 & INTERIM REPORT FOR UNIT 2 FOR PRD-83/10

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

J. P. McGaughy, Jr.

Vice -President , Nuclear P.O. Box 1640 Jackson, Mississippi 39205 Notification of lart 21 applicability made to Mr. J. P. O'Reilly, NRC, Region II by letters AECM-83/0445, dated August 5,1983 and AECM-83/0596, dated September 16, 1983.

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:

Supplied to Grand Gulf by General Electric Co. (G. E.) and manufactured by Automatic Switch Company (ASCO).

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

A. Description of the Deficiency Several hydraulic control unit scram pilot valves were determined to be buzzing, chattering and/or leaking air through the solenoid valves' vent. Examination of spare parts kits manufactured by ASCO and supplied by G. E. has revealed ASCO preassembled items which were not assembled according to ASCO assembly proccdures. The items in question are the solenoid base subassembly, core spring, and core assembly for the "A" solenoid side of the valve. The core spring was installed in reverse direction into the core contrary to ASCO procedures. Approximately 30%

of the new preassembled spare parts kits, to date, from ASCO have been found with the core springs reversed. Discussions with ASCO and G. E.

indicate that reversed core springs will cause " chattering" and eventual failure of the valve. During testing of the Scram Pilot Valves, three valves were found not to operate properly. Investigation of the "B" solenoid side of the valve revealed that the brass plug in the valve body end of the "B" core assembly had not been drilled properly which resulted in the improper seating of the stem.

I r

Attachment to AECM-83/0596 Page 2 of 3 4

B. Analysis of Safety Implicatiocs Failure of the solenoid valve due to damaged internals challenges the ability to scram a control rod, thus presenting a situation which could i represent a substantial safety hazard. No failures to scram control rods due to faulty scram pilot valve solenoids have been reported at GGNS as of this date.

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

Mississippi Power and Light discovered the defect in the "A" solenoid on July 27, 1983. MP&L evaluated the deficiency and determined the deficiency could represent a substantial safety hazard.. The deficiency was then reported to Mr. Paul Fredrickson, of your of fice, on August 4,1983. The MP&L

" Responsible Officer," Mr. J. F. McGaughy, Jr., has been notified. The defect on the "B" solenoid was discovered by Mississippi Power & Light on August 24, 1983. MP&L evaluated the deficiency and determined that it could represent a substantial safety hazard. The deficiency was then reported to Ms. L. Watson, of your office, on September 16, 1983. The MP&L " Responsible Of fice,"

Mr. J. P. McGaughy, Jr. , will be notified when he returns to his of fice.

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

The deficiency concerning the ASCO Spare Parts Kits is located at Grand Gulf 4 Nuclear Station, Unit 1. MP&L is investigating this deficiency to determine applicability to Unit 2.

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

1) All spare parts kits will be inspected prior to use to ensure the preassembled items are properly assembled.

, 2) All 193 Hydraulic Control Unit (HCU) scram pilot valves have been refurbished.

3) A chemical flush of adjacent air supply has been completed.

4) Testing of all affected components has been completed and the nonconformance tracking documents are in the process of being closed. ,

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Attachment to AECM-83/05%

Page 3 of 3

5) The three defective valves were reworked with properly manufactured internals and tested . satisfactorily.

6) MP&L is investigating this deficiency to determine applicability to Unit 2.

B. Responsible Individual .

C. _ K. McCoy T. II. Cloninger -

Plant Manager Unit 2 Project Manager Mississippi Power & Light Co. Mississippi Power & Light Co.

Responsible for U nit 1 Responsible for Unit 2 l C. Length of Time to Complete Actions For Unit 1, inspection of all parts of the spare parts kits prior to use will be an ongoing evolution as spare parts kits are received. All other actions were completed by September 6,1983.

For Unit 2, MP&L expects to determine applicability / corrective actions and provide a Final Report by February 24, 1984.

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

MP&L has no advice to offer relative to this matter to other purchasers or

[ licensees.

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