ML19308B081
| ML19308B081 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/18/1977 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| Shared Package | |
| ML19308B082 | List: |
| References | |
| NUDOCS 7912120811 | |
| Download: ML19308B081 (3) | |
Text
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UNITED STATES
- 4. *
- 4 NUCLEAR REGULATORY COMMISSION 3
j WASHINGTON, D. C. 20656
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%, '.....f Docket Nos. 50-269 July 18,1977 50-270 and SC 287 Duke Power Company ATTN: Mr. William 0. Parker, Jr.
Vice President - Steam Production Post Of fice Box 2178 422 South Church Street Charlotte, North Carolina 28242 Gentlemen:
RE: OCONEE NUCLEAR STATION, UNIT NOS. 1, 2 & 3 A large number of PWR High Pressure and Low Pressare Safety Injection Systems (HPSI and LPSI) utilize a common low pressure and a common high pressure header to feed the several cold (and in some cases hot) leg injection points. Maintenance of proper flow resistance and pressure drop in the piping system to each injection point is necessary to:
(1) prevent total pump flow from exceeding runout conditions when the system is in its minimum resistance configuration; (2) provide a proper flow split between injection points in accordance with the assumptions used in the ECCS-LOCA analyses, and (3) provide an acceptable level of total ECCS flow to all injection points equal to or above that assumed in the ECCS-LOCA analyses. Many olants have either manual or motor operated valve (s) in the lines to each injection point that have electrical or mechanical stops which have been adjusted during pre-operational testing of the plant to ensure that these flow requirements are satisified.
In view of the safety. function associated with the proper setting of valves used to throttle flow in these systems, we consider it appropriate that periodic verification be made of these valve positions. Accordingly, we request that you detemine if throttle valves are used to obtain the required flow distribution in the HPSI or LPSI systems.
If throttle valves are used, we request that you propose changes to your technical specifications to incorporate the surveillance requirements given in the enclor.'re.
In the event valves are not utilized to throttle flow in your systems, you sMuld advise us of this fact and no further action will be required.
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i Duke Power Company July 18, 1977 The above action should be completed within 60 days of receipt of this letter.
In the event you should desire further discussion of this matter, please contact us.
Sincerely, atA-A.
chwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
Enclosure:
Technical Specifications cc w/erciosure:
1
Duke Power Company Jtly 18, 1977 cc: Mr. William L. Porter Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 J. Michael McGarry, III, Esquire DeBevoise & Liberman i
700 Shoreham Building 806-15th Street, NW.,
Washington, D.C.
20005 Oconee Public Library 201 South Spring Street Walhalla. South Carolina 29691 9