AECM-84-0405, Final Part 21/Deficiency Rept PRD-84/10 Re Swelling of Gh Bettis Valve Actuator Ethylene Propylene Rubber Elastomer Seals in Contact W/Hydrocarbon Lubricant.Initially Reported on 840730.Reportable Under Part 21 for Unit 1

Final Part 21/Deficiency Rept PRD-84/10 Re Swelling of Gh Bettis Valve Actuator Ethylene Propylene Rubber Elastomer Seals in Contact W/Hydrocarbon Lubricant.Initially Reported on 840730.Reportable Under Part 21 for Unit 1

ML20094N016
Person / Time
Site:	Grand Gulf
Issue date:	08/03/1984
From:	Richard J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-84-397-000 AECM-84-0405, AECM-84-405, PT21-84-397, PT21-84-397-000, NUDOCS 8408160061
Download: ML20094N016 (5)

Text

l f' MISSISSIPPI POWER & LIGHT COMPANY  !

Helping Build Mississippi P. O. B O X 16 4 0. J A C K S O N , MISSISSIPPI 39205

? n0: 17 J. O. RICH ARD asseron vice pensioast - sevetgan August 3, 1984 U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.

Suite 2900 Atlanta, Georgia 30323 Attention: Mr. J. P. O'Reilly, Regional Administrator

SUBJECT:

Grand Gulf Nucleor Station Units 1 and 2 Docket No. 50-416/417 License No. NPF-13 File 0260/15525/15526/16694.4 PRD-84/10, Final Report for Units 1 and 2, G. H. Bettis Valve Actuator EPR Seals Swelling AECM-84/0405 On July 30, 1984, Mississippi Power & Light Company notified Mr. Bob Carroll, of your office, of a Reportable Deficiency at the Grand Gulf Nuclear Station (GGNS). The deficiency concerns the possible swelling of G. H. Bettis valve actuator Ethylene Propylene Rubber (EPR) elaatomer seals which have come in contact with hydrocarbon lubricant (Mobilgrease. 28).

This deficiency was determined to be reportable under the provisions of 10CFR21 for Unit 1 and 10CFR50.55(e) for Unit 2. Mr. Bob Carroll was notified on August 3, 1984, of the Unit 2 reportability.

Attached is our Final Report.

Yours trul p J. B. Richard RDC:dmg ATTACHMENT cc: See page 2 8408160061 840803 CML COPY PDR ADOCK 05000416 S PDR Member Middle South Utilities Systen: ((fL7 l g

Mr. J. P. O'Reilly AECM-84/0405 l NRC' Page 2 cc: Mr. J'. B. Richard

.Mr. R. B. McGehee Mr. Nicholas S. Reynolds, Esq.

Bishop, Liberman, Cook, Purcell & Reynolds 1200 Seventeenth Street, N. W.

Suite 700 Washington, D. C. 20036 Mr. Richard C.~ DeYoung, Director Of fice 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' i

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O ATTACHMENT TO AECM-84/0405' Page 1 of 3 FINAL REPORT FOR PRD 84/10 m

1. .Name and address of the ~-individual . . . informing the coensission:

J. B. Richard Senior . Vice-Pre sid ent, Nuclear P.O.. Box 1640 Jackson, Mississippi 39205

. 2. Identification of the facility ... shich ... contains a deficiency:

Grand Gulf Nuclear Station (GGNS) Units 1 and 2 Port Gibson, Mississippi 39150 This deficiency is reportable under the provisions of 10CFR21 for Unit 1 and 10CFR50.55(e) for Unit 2.

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

contains a deficiency:

Valve actuators were manufactured by.G. H. Bettis and installed on the valves by the Henry Pratt Co. The valves were supplied to NP&L by Bechtel Power Corporation, Gaithersburg, MD.

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

A. Description of-the Deficiency GGNS Unit I has Bettis actuators which utilize the Ethylene Propylene Rubber (EPR) elastomer seals in contact with Mobilgrease '

28. G. H. Bettis has determined that Mobilgrease 28 interacts with EPR elastomer seals causing the seals to swell; thus, increasing stroke times on certain isolation valves which could exceed Technical Specification limits.

G. H. Bettis recommends replacement of the seals and use of Molykote 44 lubricant. Valves that are not reworked with Molykote 44 and-are not experiencing closing time difficulties are to be stroked every 15 days while monitoring initial stroke times.

None of the affected valves at GGNS have exceeded their maximum stroke time as a result of swollen EPR elastomer seals. However, Mobilgrease 28 is used with EPR elastomer seals at GGNS. Thus, the potential for this deficiency exists at GGNS Unit 1.

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, ~ ATTACHNENT TO AECM-84/0405 Page 2 of 3 '

B. ' Analysis of Safety-Implications

. l The affected valves are used for: (1)' containment isolation and

' purge,1(2) ' control. room isolation; and (3) drywell isolation and

. vacuum relief.

Per the FSARi the. containment isolation valve closure times were established by determining the isolation requirements necessary to keep radiological effects from exceeding the guideline values established in 10CFR100. Valve stroke time surveillance periods at GGNS were'3 months for all. valves in question, except the '

control room isolation valves which had a valve stroke time

. surveillance period of 18 months. Exceeding the valve stroke i

times could provide an open' path from containment to the environment. This could result in a failure of ' containment '

isolation for a period.of time until the valve closes.

Therefore, the potential existed for radiation leakage in excess I of the guidelines established by 10CFR100.

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

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, Mississippi Power & Light received information of the' deficiency on l- January 17, 1984. .An evaluation to determine substantial safety hazard 4

was completed, and Mr. Bob Carroll, of your office, was notified on July

30,1984, concerning 10CFR21 reportability on Unit 1. Mr. Carroll was notified on August 3,,1984, concerning 10CFR50.55(e) ^ reportability on i Unit 2. The MP&L ." Responsible Of ficer", Mr. J. B. Richard, will be

notified when he returns to his office.

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

! There are 17 Henry Pratt valves with G. H. Bettis actuators at GGNS Unit i 1 which utilise the EPR elastomers and the Mobilgrease 28 where stroke l

times could exceed Technical Specification limits.

l As MP&L did not supply the component, we are not aware of locations other i than GGNS.

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.

l A. Corrective Actions Taken 4

1) Interim Actions for Unit 1 i ~

e Af fected valves will'be stroked every 15' days per. a temporary

directive procedure which was issued April 9,1984. Per MNCR E

00508-84 (written to track the deficiency). valves that exceed their maximum allowable stroke time will be serviced by

. . installing new seals and relubricating with Mobilgrease 28.

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ATTACHMENT TO AECM-84/0405

. Page 3 of - 3

- 2)' Final' Actions for Unit 1 Upon> qualification of Dow Corning Molykote 44 or substitute lubricant, all of the af fected valves will'be scheduled for replaceeent of seals and lubrication with the .new grease during the first refueling outage.

3) Actions for- Unit' 2 2 Our Architect / Engineer has redispositioned a nonconformance document (previously . issued as a result of-PRD-81/44 concerning. environmental qu'alification of actuators) to delete the reference ,to .Mobilgrease 28 as the repiscenent lubricant. Our Architect / Engineer's nonconformance decument will. crack the replacement of the Bettis actuators with qualified seals and lubricant.

~B. Res ponsible - Individual J. B. Richard Senior _Vice President, Nuclear Grand Gulf Nuclear Station Mississippi Power & Light Company C. Length of Time to Complete Actions Permanent corrective actions for Unit I will be completed during the first refueling outage.

Unit 2 corrective actions will be completed prior to Unit 2 fuel load.

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

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

offer.

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