ML20031C110
| ML20031C110 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 09/27/1963 |
| From: | Bryan R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| References | |
| NUDOCS 8110060551 | |
| Download: ML20031C110 (2) | |
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OCErh= AUTHORITY FILE cnoy UNITED STATES ATOMIC ENERGY CO3NISSION l'
HAZARDS ANALYSIS BY Tile RESEARJi AND POKER REACTO'1 SAFETY BRANCH DIVISION OF LTCENSING AND REGULATION IN THE MATTER OF YANKEE ATOMIC ELECTRIC COMPANY PROPOSED OfANCE NO. 34 DOCKET NO. 50-29 Introduction Pursuant to the provisions of Section 50.59 of the Commission's regulations, Yankee Atomic Electric Company in Proposed Change No. 34, dated May 28, 1963, requested authori:ation to interchange two valves in the Safety Injection System of the Yankee reactor and to install an additional valve in this System. These modifications would be for the purpose of improving operation of the Safety Injection System during weekly operational checks. The modifications would 11so allow the motor operated valve, which is one of the two valves being interchanged, to be isolated for maintenance when the reactor is not in operation.
Discussion A motor operated valve, located in the Safety Injection System, can be opened to provide a flow path during the weekly operational check of the system. This valve has a by-pass arrangement designed to protect the high head safety injection pum, in the event that the pump should be actuated and operate for a prolonged period without a dis-charge path. Yankee reports that the outdoor location of the notor operated valve has resulted in it being subjected to low ambient tem-peratures and that, as a result, difficulty has been experienced in operation of the valve,during the weekly Safety Injection System per-formance checks. They have, accordingly, requested authorization to interchange this valve and a high pressure valve in the same line.
This would result in the relocation of the motor operated valve and its by-pass arrangement to an indoor location.
In addition to-the valve interchange which would be made, a high pressure valve would be installed to absorb the starting pressure of the high head safety injection pump during the weekly performance checks. This valve, together with the valve which is being interchanged with the motor operated one, would provide a means of isolating the motor operated valve for maintenance at times when the reactor is not in operation.
8110060551 630927 PDR ADOCK 05000029 P
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2-We believe that the proposed new valving arrangenent in the Safety Injection System represents an innrovement in design and that the new-arrangement will not adversely affect safety.-.\\ccordingly, it is our opinion that Proposed Change No. 34 to the Technical Specifications-for the Yankee reactor should be authorized.
Conclusion Based on the foregoing, we have concluded that Proposed Change No. 34 does not present significant hazards considerations not described or implicit in the _ hazards summary report. We have _ further concluded that there is reasonable assurance that the health and safety of the public will not be endangered.
'Origina! Si;ted by:
Rotert H. Er,aa Robert 11. B:yan, Chief Research 6 Fower Reactor Safety Branch Division of Licensing 6 Regulation Date:
SEP 2 71953 l
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