View source for AECM-83-0610, Second Interim Part 21 Rept Re Failure of Agastat GP Series Relays to Change State When Called to Operate.Caused by Svc Aging in Mild Environ in Combination W/Mechanical Configurations & Tolerances of Internal Parts

{{Adams
| number = ML20080L892
| issue date = 09/22/1983
| title = Second Interim Part 21 Rept Re Failure of Agastat GP Series Relays to Change State When Called to Operate.Caused by Svc Aging in Mild Environ in Combination W/Mechanical Configurations & Tolerances of Internal Parts
| author name = Mcgaughy J
| author affiliation = MISSISSIPPI POWER &amp; LIGHT CO.
| addressee name = Oreilly J
| addressee affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION II)
| docket = 05000416
| license number = 
| contact person = 
| case reference number = REF-PT21-83-015-000
| document report number = 10CFR-50.55E, AECM-83-0610, AECM-83-610, PT21-83-015-000, PT21-83-15, NUDOCS 8310030374
| document type = DEFICIENCY REPORTS (PER 10CFR50.55E &amp; PART 21), TEXT-SAFETY REPORT
| page count = 5
}}

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MISSISSIPPI POWER & LIGH7. COMPANY Helping Build Mississ'ipNi.;              s P. O . B O X 16 4 0, J A C K S O N. MI S SI S'S I P PI' 5 9 2 0 5 J AMES P. McGAUGHY. JR.                                               $ Ee          2 , 189E I v.c m ... . ,
Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.
Suite 2900 Atlanta, Georgia 30303 At ten tio n:        Mr. J. P. O'Reilly , Regional Administrato r

==Dear Mr. O'Reilly:==

==SUBJECT:==
Grand Gulf Nuclear Station Unit 1 License No. NPF-13 Docke t No . 50-416 File 0260/15525/15526/16694.4 PRD-83/12, Interim Report #2, Failure of Agastat GP Series Relays to Switch AECM-83/0610

==Reference:==
AECM-83/0551 On September 2,1983, Mississippi Power & Light Company notified Mr. D. Verrelli, of your office, of a Potentially Reportable Deficiency at the Grand Gulf Nuclear Station (GGNS). MP&L has evaluated this deficiency and determined that it could potentially create a substantial safety hazard under the guidelines of 10CFR21 for Unit 1. Qe deficiency concerns the failure of Agastat GP series relays to change state when called upon to operate) It is indeterminate at this time as to whether this deficiency is applicable to Unit 2.
Details are provided in our attached Interim Report. We expect to submit a Final Report by November 7,1983.
Yours truly,         8   A j
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                                                  .                                   l Attachment to AECM-83/0610 Page 1 of 3 l
l INTER 1M REPORT NO. 2 FOR PRD-83/12-
: 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 Part 21 applicability made to Mr. J. P. O'Reilly, NRC, Region II by letter AECM-83/0551, September 6, 1983.
: 2. - Identification of the facility . .. which . . . contains a deficiency:
Grand Gulf Nuclear Station (GGNS) Unit 1 Port Gibson, Mississippi 39150 MP&L is presently determining the applicability of the deficiency to Unit 2.
: 3. Identification of the fira . . . supplying the basic component which . . .
contains a deficiency:
The Agastat GP series relays were manufactured by the Amerace Corporation, Control Products Division, and Supplied to Grand Gulf by the Bechtel Power Corporation in Gaithersburg, Maryland and by the General Electric Company, San Jose, California.
: 4. Na ture of the deficiency .. . and the safety hazard which . . . could be created by such a deficiency ...:
A. Description of the Deficiency The failures at GGNS involve Agastat GP series relays manufactur ed prior to August 1977 to change state when called upon to operate.
The failure of the relays to operate properly has been determined to be due to the nylon movable contact arm coming in contact with the barrier strip on the melamine phenol relay base. This resulted in mechanical interference and inability of the relay contacts to make proper contact. MP&L has determined that these failures are applicable to Agastat GP series relays manufactured prior to August 1977.- ' Agastat GP series relays manufactured at a later date were of a different design that prevented moveable arm and barrier strip interference.

                - Mr. J. P. O'Reilly                         AECM-83/0610 NRC                                         Page 2 of 2 cc:  Mr. J . B. Richard .
Mr. R. B. McGehee Mr. T. B. Conner 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 4
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Attachment to AECM-83/0610 Page 2 of 3 B.    ' Analysis of Safety Implications MP&L considers that the possible failure of the GP series Agastat relays to operate could result in degradation of the function of safety related systems and potentially create a substantial safety
                            -hazard-
: 5. The date on which the information of such deficiency ... was obtained.
Information concerning the specific deficiency at GGNS was obtained on July z5,1983. The deficiency was reported to Mr. D. Verrelli, of your of fice, on September 2,- 1983 by the MP&L " Responsible Officer", Mr. J. P.
McGaughy, Jr..
: 6. In the case of the basic component . . . ' the number and location of all such components:
                  . The deficiency concerning Agastat GP series relays is located at Grand Gulf Nuclear Station, Unit 1.        MP&L is undertaking actions 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 MP&L sent several malf unctioning GP Series Agastat relays -to General Electric for evaluation and determination of the cause of failure.
Initial indication of the failure mode of the relays indicated the possiblity of post-mold shrinkage. Failure mode testing and reliabilityL analysis .was cooperatively performed by MP&L, Amerace Corporation, and General Electric, to determine the root cause of the GGNS failures. It has been determined by G. E. and Amerace through extensive testing that the failures were due to service aging in a mild environment in combination with the mechanical configuration and tolerances of the internal parts specific to pre-August 1977 relays.
MP&L has determined by inspection the location of all the safety-related pre-August'1977 relays. MP&L will replace as required affected pre, August 1977 Agastat GP series relays with relays manufactured af ter August 1977 which are of a dif ferent design.
B.      Responsible Individual Unit 1                                       Unit 2 C. K. McCoy                                  T. H. Cloninger Nuclear Plant Manager                        Unit 2 Project Manager

e *o Attachment to AECM-83/0610 Page 3 of 3 C. Length of Time to Complete Actions MP&L has inspected and will replace as required the safety-related af fected pre-August 1977 GP Series Agastat relays. MP&L expects to provide a final report by November 7,1983.
: 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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