ML19339A066
| ML19339A066 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 07/18/1977 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Groce R YANKEE ATOMIC ELECTRIC CO. |
| References | |
| NUDOCS 8010310704 | |
| Download: ML19339A066 (4) | |
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u UNITED STATES NUCLEAR REGULATORY COMMtsSION y*
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gv Docket No. 50-29 July 18,1977 Yankee Atomic Electric Company ATTN:
Mr. Robert H. Groce Licensing Engineer
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20 Turnpike Road Westboro, Massachusetts 01581 Gentlemen:
RE:
YANKEE-ROWE ATOMIC POWER STATION A large number of PWR High Pressure and Low Pressure 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
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drop in the piping system to each injection point is necessary to:
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r (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 EUS flow to all injection points equal to or above that
. assumed in the ECCS-LOCA analyses. Many plants 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 detennine if throttle valves are used to obtain the If thr ottle required flow distribution in the HPSI or LPSI systems.
valves are used, we request that you propose changes to your technical specifications to incorporate the surveillance requirements given in the enclosure.
In the event valves are not utilized to throttle flow in your systems, you should advise us of this fact and no further action will be required.
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- I Yankee Atomic Electric Company i 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, Original Signed By i
A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
Enclosure:
1cchnical Specifications cc w/ enclosure:
ii UTION Dock JRC PDR LOCAL PDR ORB #1 Reading ASchwencer SMSheppard ABurger JWetmore OELD Ol&E(3)
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kankeeAtomicElectricCompany July 18,1977 j.g i5 cc: Mr. Donald G. Allen, President Yankee Atomic Electric Company 20 Turnpike Road
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Westboro, Massachusetts 01581
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Greenfield Public Library E5 402 Main Street Greenfield, Massachusetts 01581
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SAMPLE SURVEILLANCE TECHNICAL SPECIFICATIONS FOR PWR HPSI AND LPSI SYSTEM THROTTLE VALVE STOPS 1.
The correct position of each electrical and/or mechanical position stop for the following throttle valves shall be verified:
a.
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
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System is required to be operable.
b.
At least once per 18 months.
HPSI System LPSI System Yalve Number Valve Number 1.
1.
2.
2.
3.
3.
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4.
4.
5.
5.
2.
A flow balance test shfil be performed during shutdown to confirm 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 gpm Injection Leg 1
gpm Injection Leg 1
gpm Injection Leg 1
gpm Injection Leg 1
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Injection Leg 1
gpm Injection Leg 1
gpm 6ases The purpose of these surveillance requirements is to provide assurance that proper ECCS flows will be maintained in the event of a LOCA. Mainten'anc e 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 acceptable level of total ECCS flow to all injection points equal to or above that assumed in the ECCS-LOCA analyses.
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