ML20244A821
| ML20244A821 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/02/1976 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| GQL-1242, NUDOCS 7911150554 | |
| Download: ML20244A821 (7) | |
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1 Docket File /e 1-E'!
T July 1, 1977 NRC PDR
' Docket No.:
50-289 OR 4 Rdg RReid RIngram metropolitan Edison Company re ATTN: Mr. J. G. Herbein JWetmore Vice President Attorney, OELD
,1 P. O. Box 542 (3)
Reading, Pennsylvania 19603 enhut TBAbernathy i
Gentlemen:
JRBuchanan fray RE: THREE MILE ISLAND UNIT H0. I II A large number of PWR High Pressure and Low Pressure Safety Injection Ij 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:
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(1) prevent total pump floi from exceeding runout concitions 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 I
level of total ECCS flow to all injection points equal to or above that assumed in' the ECCS-LOCA analyses. Many plants have either manual or
.kli motor _ operated valve (s) in the lines to each injection point that have W
electrical or mechanical stops which have been adjusted during pre-j operational testing of the plant to ensure that these flow requirements are satisified.
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In view of the safety function associated with the proper setting of
i valves used to throttle flow in these systems, we consider it appropriate ll
- that periodic' verification be made of these valve positions. Accordingly,
~j we request that you detemine if throttle valves are used to obtain the required flow distribution in the HPSI or LPSI systems.
If throttle -
J valves are used, we request that you propose changes to your technical ll spec.lfications to incorporate the surveillance requirements given in
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the enclosure.
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In the event valves are not utilized to throttle flow in your systens,
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you should advise us of this fact and no further action will be required f-(gOyL 7m.s oDP fg A
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,'1 Metropd f can Edison' Company The-above action should be completed within 60 days of receipt of In the event you should desire further discussion of this letter.
this c$atter, please contact us.
St ricerely,
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i Robert W. keid, Chief Operating Reactors Branch Fu i
Division of Operating Reactors g
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Enclosure:
Technical Specifications
'cc w/ enclosure: See next page a
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1878 - 826 424 W u; s.oovraNggNT PRINTING OFFICES Nac rouw s18 (9 76) NRCM 0240 I-
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Metropolitan Edison Company
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G. F. Trowbridge, Esquire Shaw, Pittman, Potts & Trowbridge j'-
g 1800 M Street, N. W.
E Washington, D. C.
20036 GPU Service Corporation
' Richard W. Heward, Project Manager 4
Thomas M. Crimmins, Jr., Safety i.
and Licensing Manager 260 Cherry Hill Road Parsippany, New Jersey 07054 Pennsylvania Electric Company l
Mr. R. W. Conrad Vice President, Generation 1001 Broad Street Johnstown, Pennsylvania 15907 Mr. Weldon B. Arehart, Chairman Board of Supervisors of Londonderry,,
Township RFD#1, Geyers Church Road Middletown, Pennsylvania 17057 Miss Mary V. Southard, Chairman i
Citizens for a Safe Environment P. O. Box 405
- M Harrisburg, Pennsylvania 17108 Government Publications Section State Library of Pennsylvania j
Box 1601 (Education Building) i Harrisburg, Pennsylvania 17126 1
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s SAMPLE SURVEILLANCE TECHNICAL SPECIFICATIONS FOR PWR HPSI AND LPSI SYSTEM THROTTLE YALYE 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 System is required to be operable.
b.
At least once per 18 months.
HPSI System LPSI System Valve Number Valve Number 1.
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2.
2.
3.
3.
4 4
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2.
A flow balance test shall be performed during shutdown to confirm the following minimum injection flow rates following completion of HPSI or LPSI system modif.ications that alter system flow characteristics:
HPSI System - Single Pump LPSI System - Single Pumo Injection Leg gpm Injection Leg gpm Injection Leg gpm Injection Leg gpm Injection Leg
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gpm Injection Leg
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gpm
. Injection Leg gpm Injection Leg spm Bases The purpose of these surveillance requirements is to provide assurance that proper ECCS flows will be maintained in the event of a LOCA.
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,
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(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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