ML20235C962
| ML20235C962 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 09/22/1987 |
| From: | Whittier G Maine Yankee |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 9164L-SDE, GDW-87-223, MN-87-105, NUDOCS 8709250069 | |
| Download: ML20235C962 (5) | |
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MaineYankee RELIABLE ELECTRICITY FOR MAINE SINCE 1972 EDISON DRIVE. AUGUSTA, MAINE 04330.(207) 622 4868
.aptember 22, 1987 MN-87-105 GDH-87-223 i
i United States Nuclear Regulatory Commission Attention:
Document Control Desk Hashington, D. C.
20555
References:
(a)
License No. DPR-36 (Docket No. 50-309)
(b) USNRC Letter to MYAPCo dated August 21, 1987, Inspection Report 50-309/87-12
Subject:
Inspection Report 87-12:
Response to Notice of Violation Gentlemen:
- This letter-is in response to the Notice of Violation transmitted in Reference (b) which identified violations concerning acceptance criteria for testing of safety-related overcurrent devices and the reflection of field installation of overcurrent devices on electrical drawings.. Attachment A restates the Notice of Violation for clarity with our response to each item following. As our response indicates, full compliance was achieved prior to resumption of power operations on August 24, 1987 following the outage.
During the inspection, Maine Yankee committed to complete several actions by August 31, 1987. Due to the extended outage, these items were not completed as originally anticipated. He have discussed these issues and the following scheduled actions with Mr. S. Pullani of your staff.
Based on commitments made as a result of the subject inspection, Maine
- Yankee will:
1.
Revise the cable ampacity study to include feeder full load currents by October 31, 1987.
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United States Nuclear Regulatory Commission Page Two Attention: ~ Document Control Desk MN-87-105 2.
Complete'the breaker coordination study by October 31, 1987 and provide this.information to the NRC following completion.
3.
Develop a formal procedure to track electrical load growth by October 31, 1987.
4.
Determine the alternate solutions to' address the limited short circuit capability of the 6.9 kV and 4.16 kV switchgear by October 31, 1987. A plan and implementation schedule for a final solution will be made by January 31, 1988.
The NRC will'be notified-by letter.
He trust this information is satisfactory.
However, if you should have any questions, please feel free to contact me.
Very truly yours, HAINE YANKEE ATOMIC POWER CM PlJY E10 AV G. D. Whittier, Manager Nuclear Engineering and Licensing GDH/bjp Enclosure cc: Mr. Victor Nerses Mr. Hilliam T. Russell Mr. Pat Sears Mr. Cornelius F. Holden Mr. S. V. Pullani, NRC Region I 9164L-SDE
MaineYankee ATTACHMENT A MN-87-105 Notice of Violation i
A.
10 CFR 50, Appendix B, Criterion XI, requires that safety related components be-tested in accordance with written test procedures which incorporate acceptance limits contained in applicable design documents.. Maine Yankee Operations QA Manual, Revision 3,Section XI, Paragraph 4b, requires all departments to be responsible for establishing test programs, procedures and acceptance criteria.
Contrary to the above, as of June 2, 1987, safety related overcurrent devices on 480 volt buses 7 and 8 were tested in accordance with calibration procedure 5-77-3, Inspection ?nd Repair of General Electric AK-2 circuit breakers, Revision 16, which did not incorporate acceptance lin.its contained in the design documents (Drawings 1150-E-54A dated March 29, 1970 and 0108-B-9487 dated October 15, 1970).
This is a Severity Level IV Violation.
Maine Yankee Resoonse The setpoints for the overcurrent devices on Buses 7 and 8 were reestablished and the overcurrent devices were recalibrates as required.
Acceptance limits were established. A temporary step-by-step calibration procedure for the overcurrent devices was written to include these setpoints.
5.
Before the next scheduled surveillance on these overcurrent devices, a step-by-step calibration procedure for overcurrent devices which includes setpoints and acceptance limits will be developed.
Full compliance was achieved by June 17, 1987.
10 CFR 50, Appendix B, Criterion VI, requires that drawings (documents) including changes are reviewed for adequacy and used at the location where the prescribed activity is performed. Maine Yankee Operations QA Manual, Revision 3,Section VI, Paragraph A, l
requires measures to review and control documents including revisions thereto.
Contrary to the above, as of June 2, 1987, the following drawings were not revised to reflect the field installation in that:
9164L-SDE
MaineYankee
- - a.
Drawing ll550-FE-lH, 480V One Line Diagram Unit Substation, Sheet 1, Revision 11.
1.
. Field installation of overcurrent devices in positions ISB, 15C,150 on Bus 8 and positions 138,13C,'13D on Bus 7 were rated 225 Amperes unlike the drawing representation of 250 Amperes.
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2.
The overcurrent device installed at position 16D an Bus 8 was rated 60C Amperes unlike the drawing representation of 350 Amperes.
b.
Drawing 1150-FE-1C, One Line Diagram-480V MCC-7A, 8A and 138, Revision 20.
1.
Field installation of molded case breaker in position 2FBR was rated 15 Amperes unlike the drawing representation of 30 Amperes.
2.
Field installation of molded case breakers in position 5 RHR was rated 20 Amperes unlike the drawing representation of 30 Amperes.
The lack of acceptance criteria for calibrating the overcurrent devicer and the presence of overcurrent devices different than the plant' design drawing can potentially degrade the performance of the safety related buses.
i This is a Severity Level IV violation.
Maine Yankee Response Part b of this violation identifies 1150-FE-lC, Revision 20 as the drawing that contained the discrepancy. He believe instead that it was electrical one-line drawing ll550-FE-1L, Revision 21. Also field installation of the molded case breaker in position 2FBR was correctly indicated on the drawing to be rated at 70 amperes.
However, the field installation of the molded case breaker in position 1FB was rated 15 amperes unlike the drawing representation of 30 amperes. He believe your concern was with position 1FB and not 2FBR.
Maine Yankee has reviewed all electrical one-line drawings for safety-related ac and dc buses for discrepancies between the installed ratings for the protective devices and the drawing representation of the ratings. As a result of this review, several drawing revisions were implemented by June 30, 1987.
Prior to responding to this violation, it was discovered that Item b.1 of this violation as corrected above had been overlooked when the drawing was revised.
This oversight has been promptly addressed and the drawing is being revised.
I 9164L-SDE
MaineYankee
- 6.
Maine Yankee plans to review all electrical one-line drawings for non-safety related electrical busses and motor control centers by January 1, 1989.
Full compliance will be. achieved by September 25, 1987.
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