ML20140D457
| ML20140D457 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 12/17/1984 |
| From: | Zwolinski J Office of Nuclear Reactor Regulation |
| To: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| References | |
| GL-83-28, LSO5-84-12-011, LSO5-84-12-11, NUDOCS 8412180534 | |
| Download: ML20140D457 (5) | |
Text
r December 17, 1984 Docket No. 50-29 LS05-84-12-011 Mr. James A. Kay Senior Engineer - Licensing Yankee Atomic Electric Company 1671 Worcester Street Framingham -Massachusetts 01701
Dear Mr. Kay:
SUBJECT:
GENERIC LETTER 83-28 ITEMS 4.2.1 AND 4.2.2 Re:
Yankee Nuclear Power Station By letter dated November 5, 1983 you responded to Generic Letter 83-28. We have now reviewed your submittal with respect to Items 4.2.1 and 4.2.2 and have determined that we need additional information for us to complete our review.
Please provide your response to the enclosed request for additional information within 60 days of the date of this letter.
This request for information was approved by the Office of Management and Budget under clearance number 3150-0011 which expires April 30, 1985.
Comments on burden and duplication may be directed to the Office of Management and Budget Reports Management Room 3208, New Executive Office Building, Washington, D.C.
20503.
Sincerely, Original signed by John A. Zwolinski, Chief Operating Reactors Branch #5 Division of Licensing
Enclosure:
Request for Additional Information cc w/ enclosure:
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Mr. James A. Kay December 17, 1984 cc Mr. James E. Tribble, President Yankee Atomic Electric Company
~1671 Worcester Road Framingham, Massachusetts- 01701 Chairman Board of Selectmen Town of Rowe Rowe, Massachusetts 01367 U.S. Environmental Protection Ac,ency Region I Office ATTN:
Regional Radiation Representative JFK Federal Building Boston, Massachusetts 02203 Resident Inspector
' Yankee Nuclear Power Station c/o U.S. NRC Post Office Box 28 Monroe Bridge, Massachusetts 01350 Dr. Thomas E. Murley, Regional Administrator Nuclear Regulatory Commission, Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Robert M. Hallisey, Director Radiation Control Program Massachusetts Department of Public Health 150 Tremont Street, 7th Floor Boston, Massachusetts 02111 1
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.YANKCCNUCLEAR-POWERSTATION.(YANKEE)
HEQU Qi_FOR ADDITIONAL INFORMAT_ ION GL 83.-28, ITEMS 4.2.__1 AND 4.2.2 INTRODUCTION Yankee Atomic Electric Company, the licensee for Yankee, submitted their re:;ponse to Generic Letter 83-28 on November 5,1983. That submittal has been reviewed with respect.to Items 4.2.1 and 4.2.2 of the Generic Letter. The licensee's response was not sufficiently detailed to permit an evaluation of the adequacy of the periodic maintenance and trending programs for the breaksrs. The following additional information is required to evaluate compliance with Items 4.2.1 and 4.2.2.
1.
Item 4.2.1 - Periodic Maintenance Program for Reactor Trip Breakers.
1.1 Criteria for Evaluating Compliance with Item 4.2.1
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The Yankee Reactor Trip' System; utilizes Westinghouse DB-25 circuit breakers. The primary criteria for an acceptable maintenance program for this breaker, are contained in Maintenance Program for DB-50 Reactor Trip Switchgear, Rev. O, dated October 14, 1983, by Westinghouse. The NRC Staff, Equipment Qualification Branch, has reviewed and endorsed the Westinghouse' Maintenance Program for DB-50 Switchgear. The staff believes c
that this criteria, also, applies to DB-25 breakers because of similarity in design.
Specifically, the criteria used to evaluate compliance include those items in the Westing-house program.that relate to the safety function of the breaker, supplemented by those measures that must be taken to accumulate data for trending.
1.2 Issues Relating to Item 4.2.1 The licensee response states that the Yankee maintenance procedures detail the parts of the breakers to be i-inspected, record conditions and replacement parts installed, and includes housekeeping and lubrication, at refueling intervals.
No procedures were included in th.e submittal.
Does the Yankee periodic maintenance program for the reactor trip breaker: include, on a six month basis:
1.
Verification of trip bar freedom; 2.
Verification of operating mechanism alignment and freedom, using the procedure identified in the Westinghouse program; 1
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1 3.
Retaining ring verification, 33 places; 4.
Verification of nut and bolt tightness; 5.
Vertftcation of pole bases physical condition; 6.
Verification of aicing and main contacts physical condition, using the procedure identified in the
-Westinghouse program;.
7.
Verification of insulating link's physical condition; 8.
Verification of wiring insulation and termination physical condition; 9.
Verification of are chute physical condition; lb. Verification of breaker cleanliness;
- 11. Undervoltage Trip Attachment (UVTA) dropout voltage test and lubrication, using the procedure identified in the Westinghouse program;
- 12. ShuntTripAttachment(STA)operationverificaUon;
- 13. Verification of operatio.n of auxiliary switches;
- 14. Inspection of positioning lever condition, using the procedure identified in Westinghouse program;
- 15. Functional test of the breaker prior to retur.ning it to service, using the procedure identified in the Westinghouse program?.
f Does the Yankee periodic maintenance program for the i
re' actor trip breakers include, on a refueling interval basis:
1.
Verification of cell interlock operation; 2.
Measurement of trip force required, using the procedure identified in the Westinghouse program; 3.
Breaker response time for undarvoltage trip;
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4.
Functional test of the breaker prior to returning it to service, using the procedure identified in the Westinghouse program The licensee should conf 4rm that the Yankee includes these 19 items at the specified intervals. periodic maintenance program 2
p.
2.
Item 4.2.2 - Trending of Reactor Trip Breaker Parameters to Forecast Degradation of Operability.
2.1 NRC and! Westinghouse' Criteria-for Evaluating Compliance with Items 4.2.:
Four parameters have been identified as trendable and are included in the criteria for evaluation. These are (1) undervoltage trip attachment dropout voltage, (2) trip force, (3) breaker response time for undervoltage trip, and (4) breaker insulation resistance.
2.2 Issues Relatine to Item 4.2.2 The licensee submittal states that " Pertinent information is entered on the equipment history to provide for identification of" recurring problems; the response, however, neither described the licensee's trending program -
nor identified those parameters which are being trended.
The licensee should":conmit to1 inclusion of trip force, breaker response time and dropout voltage for undervoltage trip and breaker insulation resistance as trending parameters. The licensee should also identify the organization which will perform trend analysis, how often the analysis will be performed and how the information derived from the analysis will be used to affect periodic maintenance.
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