ML19199A369
| ML19199A369 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/14/1976 |
| From: | Arnold R Metropolitan Edison Co |
| To: | O'Reilly J NRC Office of Inspection & Enforcement (IE Region I) |
| Shared Package | |
| ML19199A368 | List: |
| References | |
| GQL 1719, GQL-1719, NUDOCS 7905010631 | |
| Download: ML19199A369 (2) | |
Text
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C/..,c es yz, ua... nm METROPOLITAN EDtSON COMPANY :wwoi.:av er acuta.u.pvauc unum:ccarcnancu
.T CFFICE SOX 542 READING. PENNsYLVANI A '9G03 TELEPHCNE 215 - 923-;601 December ik, 1976 G@ 1719 l
Mr. J. P. O'Reilly, Director f
Of fice of. Inspection & Inforce=ent, Regic 1 U. S. :Tuclear Regu.latcry Oc= mission i
631 Park Avenue Kin $ cf Prussia, Pennsylvania 19hC6 Eear Sir:
Three.!ile Island :Tuclear Statica Unit 2, (TMI-2)
N License :To. CP?R-66 Dceket :To. 50-320 i
Makeup Pu=p Pressure Switch Cn :icve ber 11, 1976, your office was verbally notified of a situaticn which Metropolican Idisen Cc=pany censidered to be reportable in accordr.ce with e -"<
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7 day follcw.up letter and is submitted three days late due to a clerical errcr.
I.escription The dischar~e pressure svitch centacts for the make-uo. cura.s vill tric. the euro.
e if the pressure is belev 2200 psig after a five seccnd start-up time.
'"he discharge pressure switch for the =akeup pump vas originally intended to be a redundant indication of Icv suctica pressure.
It was set to clear an ala.._
and pump stcp centrcl function as discharge pressure exceeded 80 psig.
If tha pressure were to stay lov, it vculd have been r. indication of pu=p cavitatica r.nd therefore, icv suction pressure.
'"he original icgic called fcr a icv sucticn pressure alar _. and pu=p trip after a time delay for coincident icv suction and discharre c.ressure (a 2 sienal interlcek). Since icv suction pressu e is interlceked to prevent pump strt-up cr trip the pump :.f it is running by other
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9' G. J. P. C'RE LLY December ih, 1976
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Analysis of Safety Irelications Under LCCA conditions, high pressure injection would not be available.
Corrective Acticn The preposed correc+ive action for the =ake-up pump discharge pressure switch interlock problem is as fellevs:
The Discharge Pressure Svitch vill be retained to alar = at a.
about 2200 psig to alert the cperator to a potential less of RC Pu=p Seal injectica water flev.
b.
The centrol function frcm this svitch will be discennected, as vill the associated time delay relay and redundant suctica pressure svitch centacts.
c.
The pump vill still be tripped en lov suction pressure at any time.
Very truly ycurs,
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R. C. Ar.cid Vice President
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