ML20036C099
| ML20036C099 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/07/1993 |
| From: | Frizzle C Maine Yankee |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20036C100 | List: |
| References | |
| CDF-93-91, MN-93-60, NUDOCS 9306140067 | |
| Download: ML20036C099 (5) | |
Text
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MaineYankee HE UABLE ELECIFHCITY FOA MAINE SINCE 1972 Charles D Fnzzle Ed: son Dnve Presdent Augusta. Maire 04336 (207) 622-4868 June 7, 1993 MN-93-60 CDF-93-91 Proposed Change No. 181 UNITED STATES NUCLEAR REGULATORY COMMISSION Attention: Document Control Desk Washington, DC 20555
References:
(a)
License No. DPR-36 (Docket No. 50-309)
(b) NUREG-1432, Revision 0, " Standard Technical Specifications for Combustion Engineering Plants," issued September 1992 (c) NUREG-1366,
" Improvements to Technical Specifications Surveillance Requirements," issued December 1992
Subject:
Proposed Technical Specification Change No. 181 - AFW/EFW, Safety Injection and Containment Spray Systems Surveillance Requirements Gentlemen:
Maine Yankee hereby submits, pursuant to 10CFR50.90, this application to amend Specification 4.6.A, Safety Injection and Containment Spray
- Systems, and Specification 4.6.8, Emergency Feedwater Pumps, of the Maine Yankee Technical Specifications.
The first proposed change is to modify Specification 4.6.A as follows:
a.
A change to the ECCS valves testing frequency of Specification 4.6.A.I.b is proposed to gain consistency of the ECCS valve surveillance requirements with the ASME Section XI In-Service Testing Program.
This change provides for testing the automatically operated ECCS valves quarterly vice monthly, b.
A change is proposed to revise the Containment '., pray Header testing frequency of Specification 4.6.A.3 from once eve ry 5 years to once every 10 years consistent with References (b) and (c), and the ASME SedMr. XI In-Service Testing Program.
c.
A change to the Containment Isolation Valves testing requirements is proposed to gain consistency with the ASME Section XI In-Service Testing Program.
This change clarifies the quarterly requirements of Specification 4.6.A.4 and adds a new refueling interval section as Specification 4.6.A.2.g.
The second proposed change is to modify Technical Specification 4.6.B to change the Auxiliary Feedwater (AFW)/ Emergency Feedwater (EFW) pump surveillance frequency requirements to be consistent with the ASME Section XI In-Service Testing Program as provided by the code.
This change is consistent with References (b) and (c) and provides' for testing the AFW/EFW pumps quarterly vice monthly.
In addition,,
editorial changes to the Basis section are proposed.
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r UNITED STATES NUCLEAR REGULATORY COMMISSION MN-93-60 Attenti_on: Document Control Desk Page 2 A description of the proposed changes and a summary of the Significant Hazards evaluation is presented in Attachment A. As discussed in the attachment, this change does not involve a significant increase in the probability or consequences of an accident previously evaluated, create the possibility of a new or different kind of accident from any accident previously evaluated or involve a significant reduction in a margin of safety.
Thus, based on this evaluation, it is concluded that there is reasonable assurance that operation of the Maine Yankee plant, consistent with the proposed Technical Specifications, will not impact the health and safety of the public.
Revised Technical Specification pages 4.6-1, 4.6-3, 4.6-4, 4.6-5 and 4.6-6 are included in Attachment B.
This proposed change has been reviewed and approved by the Plant Operation Review Committee. The Nuclear Safety Audit and Review Committee has also reviewed this submittal.
A representative of the State of Maine is being informed of this application by a copy of this letter.
We request that this proposed change be made effective within 30 days after issuance.
Very truly yours, a vt
,vf Charles D. Frizzle President and Chief Executive Officer WBD/ jag c:
Mr. Thomas T. Martin Mr. E. H. Trottier Mr. Charles S. Marschall Mr. Clough Toppan STATE OF MAINE Then personally appeared before me, Charles D. Frizzle, who being duly sworn did state that he is President and Chief Executive Officer of Maine Yankee Atomic Power Company, that he is duly authorized to execute and file the foregoing request in the name and on behalf of Maine Yankee Atomic Power Company, and that the statements therein are true to the best of his knowledge and belief.
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ATTACHMENT A Soecification 4.6.A Descriotion of Proposed Chanaes This proposed change to Specification 4.6.A.I.b revises the testing of automatically operated valves from monthly to quarterly consistent with the Maine Yankee In-Service Testing Program.
Reference (b) indicates that performance of these valves is demonstrated and monitored by the In-Service Testing Program required by 10CFR50.55a and Section XI of the ASME Boiler and Pressure Vessel Code. The ASME code in effect for Maine Yankee is the 1986 edition with selected portions of the 1989 edition. The later edition requires quarterly valve testing where practical. This proposed change will link the Emergency Core Cooling System (ECCS) valve surveillances to Technical Specification 4.7, Inservice Inspection and Testing of Safety Class Components.
In addition, minor editorial changes are proposed to this specification to clarify.
existing requirements.
The proposed change to Specification 4.6.A.3 revises the frequency of containment spray header testing from once every 5 years to once every 10 years. consistent with the In-Service Testing Program. Performance of this surveillance demonstrates that each spray nozzle is unobstructed and provides assurance that spray coverage of the containment during an accident is not degraded.
Due to the passive design of the nozzle, a test at 10 year intervals is considered adequate to detect obstruction of the spray nozzles. This change is consistent with SR 3.6.6A.9 of Reference (b) and Section 8.1 of Reference (c).
The present Technical Specification 4.6.A.4 specifies that "where practicable, each containment isolation valve shall be stroked to the position required to fulfill its safety function every three months.
Those valves that cannot be tested without possible adverse effects during plant operation shall be tested during. each cold shutdown if not tested during the previous three months". The proposed change splits the existing Specification 4.6.A.4 into two parts.
The first part addresses the quarterly requirement and revises the existing Specification 4.6.A.4.
Where practicable, this test verifies that each containment isolation valve is stroked to its safety function position which demonstrates operability. The frequency of this surveillance is in accordance with the In-Service Testing Program. The second part addresses the refueling outage requirements and is proposed as new Specification 4.6.A.2.g.
This surveillance ensures each valve not tested under Specification 4.6.A.4 is tested each refueling outage.
Sianificant Hazards Evaluation-This proposed change is requested in order to revise the ECCS and Containment Isolation Valve and Containment Spray Header surveillance requirements in Section 4.6. A of the Maine Yankee Technical Specifications. As such, this proposed change would not:
1.
Involve a significant increase in the probability or consequences of an accident previously evaluated.
This change only revises the-periodicity of the surveillance requirements for these valves and spray headers. The reliability of the valves is established and maintained by the Generic letter 89-10 motor operated valve (M0V) program and 's not affected by this change. -The purpose of these surveillance requirements is to verify the valves and spray headers are operable. The revised surveillance requirements will continue to demonstrate valve and spray header operability.
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2.
Create the possibility of a new or different kind of accident from any previously evaluated.
Verification of valves and spray header operability is maintained while requiring no system configuration changes in order to perform surveillance testing, which adversely affect system functional performance.
3.
Involve a significant reduction in a margin of safety. Verification of valve and spray header operability is maintained. The Inservice Testing Program at Maine Yankee will continue to ensure that valve and spray header operational readiness criteria are consistent with the requirements of ASME Section XI.
System performance surveillance will continue to be conducted in accordance with plant Technical Specifications.
Based on the above, it is concluded that there is reasonable assurance that operation of the Maine Yankee plant, consistent with the proposed Technical Specifications, will not endanger the health and safety of the public.
Specification 4.6.8 Descriotion of Proposed Chanaes This proposed change modifies the Auxiliary Feedwater (AFW)/ Emergency Feedwater (EFW) l pump surveillance frequency from monthly to quarterly be consistent with the ASME Section XI Inservice Testing Program as provided by the code. Surveillance of these puiaps and valves occurs when they are being tested to meet the in-service testing requirad by Section XI of the ASME Boiler and Pressure Vessel Code.
Maine Yankee Technical Specification 4.7 requires compliance with Section XI of the ASME code for inservice testing of safety class components.
Maine Yankee procedural controls presently require EFW pump tests to be conducted on a staggered basis. This change is consistent with SR 3.7.5.2 of Reference (b).
Section 9.1 of Reference (c) i recommends a reduction in the frequency of testing the AFW/EFW pumps from monthly to quarterly as a reasonable step to reducing the rate of pump wear and failures t
resulting from testing the pumps through the minimum flow recirculation line.
The Basis section presently contains reference to the Auxiliary Feedwater System and/or components.
The system at Maine Yankee that was formerly the Auxiliary feedwater System now consists of an Emergency Feedwater System and an Auxiliary Feedwater System.
This breakup of the one system into the two separate parts has i
been reflected in most of the applicable portions of the Technical Specifications through previous amendments. Maine Yankee proposes to change the terms " Auxiliary" to " Emergency", or " Emergency and Auxiliary" in the Basis section.
Sianificant Hazards Evaluation i
This proposed change is required in order to revise the AFW/EFW surveillance requirements in Section 4.6.8 of the Maine Yankee Technical Specifications. As such, this proposed change would not:
I.
Involve a significant increase in the probability or consequences of an accident previously evaluated. This change only revises the surveillance requirements j
for these pumps and valves. The purpose of these surveillance requirements is
)
to prove that the pumps and valves are operable.
The longer test interval
)
should result in greater availability by reducing the rate of test induced failures which should offset any loss in reliability. The revised surveillance requirements will continue to demonstrate pump and valve operability.
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- 2.. Create the possibility of a new or different kind of accident from any j
previously evaluated. Verification of pump and valve operability is maintained while requiring no system configuration changes in order to perform surveillance testing, which adversely affect system functional performance.
3.
Involve a significant reduction in a margin of safety. Verification of pump and-valve operability is maintained. The Inservice Testing Program at Maine Yankee will continue to ensure that pump operational readiness criteria are consistent with the requirements of ASME Section XI. System performance surveillance will continue to be conducted in accordance with plant Technical Specifications.
Based on the discussion above, it is concluded that there is reasonable assurance that operation of the Maine Yankee plant, consistent with the proposed Technical Specifications, will not endanger the health and safety of the public.
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