ML19308B085
| ML19308B085 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/18/1977 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19308B082 | List: |
| References | |
| NUDOCS 7912120814 | |
| Download: ML19308B085 (1) | |
Text
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9 SAMPLE SURVEILLANCE TECHNICAL SPECIFICATIONS.'OR PWR HPSI AND LPSI SYSTEM THROTTLE VALVE STOPS 1.
Tne correct position of each electrical and/or mechanical position stop for the following throttle valves shall be verified:
d.
Within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> following completion of each valve stroking operation or maintenance on the valve when the HPSI or LPSI System is required to be operable.
b.
At least once per 18 months.
HPSI System LPSI S/ stem Valve Number Valve Number 1.
1.
2.
2.
3.
3.
4.
4.
5.
5.
2.
A f)ow balance test shall be perfonned during shutdown to confim the following minimum injection flow rates following completion of HPSI or LPSI system modifications that alter system flow characteristics:
HPSI System - Single Pump LPSI System - Single Pump Injection Leg 1
gpm Injection Leg 1
gpm Injection Leg 1,
gpm Injection Leg 1
gpm Injection Leg 1
gpm Injection Leg 1
gpm j
Injection Leg 1
gpm Injection Leg
_1 gpm Bases The purpose of these surveillance requirements is to provide assurance that proper ECCS flows will be maintained in the event of a LOCA. Mainten'ance 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 the proper flow split between injection points in accordance with the assumptions used in the ECCS-LOCA analyses, and (3) provide an occeptable level of total ECCS flow to all injection points equal to or asove that assumed in the ECCS-LOCA analyses.
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Docket No 50-26 w-270 "g
e 1377 i
and 50-207 Ouke Power Company ATT;1: rir. Willian 0. Parker, Jr.
Vice President - Steam Production
?ost Office Sox 2178 422 South Church Street Charlotte, Morth Carolina 23242 Gentlinen:
RE: CC0teEE NUCLEAR STATION, Uti!T NOS.1, 2 o 3 A large number of PWR tlign Pressure and Low Pressure Safety Injection Systens (hvSI and LPSI) utilize a coa =on low pressure and a cocraon high pressure header to feed the several colii (and in some cases hos) leg in,iection points. itaintenance of proper flow resistance ana pressure drop in the piping system to each injection point is necessary to:
(1) prevent total pump fio,< fron exceeding runout conditions wnen the systen is in its minicum resistance configuration; (2) provide a proper flow split between injection points in accordance with the assunptions used in the ECCS-LOCA analyses, and (3) provide an acceptaole level of total ECCS flow to all injection points equal to or aDove that assumed in the ECCS-LOCA analyses. tiany plants have either manusi or cotor operated valve (s) in tne lines to eacn tajection point that have electrical or necnanical stops wnich have been adjusted during pre-operational testing of the plant to ensure that these ficw requirements are satisified.
In viett of the safety function associateo with the proper setting of valve:s used to throttle flow in these systeos, we consider i' appropriate tnat periodic verification be made of these valve positions.
Accorrtingly, we request tcat you detemine if throttle valves are used to obtain the reouired flow cistricution in the HPSI or LPSI systems.
If throttle valves ara used, we request that you propose changes to your technical specifications to incorporate the surveillance requircments given in the enclosure.
In the event valves are net utill:ed to, throttle flow in your systeas, you shoulit aavise ils of this fact and no further.1ction will ae required.
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NRC FORM 313 (9 76) NRCM 0240
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The aoove action s' culd be completed within 60 Mys of receipt of r
this letter.
In the event you shoulo cesire furthe.11scus<1on of this matter, please contact us.
Sincerely, Original Signed By A. Schwencer, Chief Operating Reacturs 3ranen il Division of Operisting Reactors
Enclosure:
Technical Specifications cc w/ enclosure:
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