ML20005A593
| ML20005A593 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 06/18/1981 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, SBN-164, SNB-164, NUDOCS 8106300482 | |
| Download: ML20005A593 (2) | |
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Telecon of ?!ay 21, 1991 het-.en R.
r;.21 10, 'WC.nd D. Maidt nd, iAEC 10 CFR 50.55(e) Defici.ncy E. port on Control and P r o t e c t f.:, n S
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On May 21, 1981 we reported that
'J. s t i nghou se had identi fied a control and prc.t ec t ion sys t em in te ra c t ion conce rn ir.volvi ng the Volume Control Tank (VCT) le vel ins t rumentation con t rol system.
This report is bei ng fil-d in ai cordance with the thi r ty day repor ting requi rement s of 10 CFR 50.55 (e).
The f ollowi ng di scussion describes the system interaction concern.
Mseme the plant is opera ting with a cent rif ugal cha rging pump performing the norral cha rgi ng f unct ion.
(!;ormally one of the three a vai l a bl e cha rging pumps is ri.e.ing.!th another as standby.) A failure of the VCT level control syst-m c.e e s the letdown flow to be diverted to the li qud hol dup tank.
The LCT liquid i nventory dec reaws due to normal cha rging sit hout any.<.. up to the VCT ef a Ie:dcwn.
'Ji t hou t ope ra t o r i nte rvention the VCT could pty <ausing the ep-ra ting cent rif ugal charging ptenp to he :3a. aged due to irss of soction fluid.
If it is f urthe r assumed that one c% r;;ing pt:p is out of se rv ice, as alirwed by the Technical Specifications, there wcuid then be only one
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The one r...u;ning ump daes not thcn eet the Cngle 'a!Iure c r i t,- r i o n.
yolicwing the failure in the VCT level esnt rol systen, the opera t ur -oul d ha ve a;pr nirately ten minutes to transfer the chac3 ing pump suction froc the VCT i
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U.S. %c: : r E< gelato ry Cormi ss *cn Fase 2 S E N--164 I f r.o e p. r a t o r.4 c t i o n. e c u r s a t this t i me,
t'r.n the p u.rp in opera t ion c oul d be d -
- 43. d.' ae to loss of 'uction, snd t he pi ent wculd continue to lese i r. vent ory due to etdcwn.
"o cver, this is a siev 'ess in wa t e r i nven t o ry.
'.u t or.a t i c 1.- : ' r. vn iso'ation sh oul d c.c c u r.
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-ga t e t h i s sce:u r io ar.d pos i t ively dd re :s the idcntif'-d concern.
Scibrcok is. c i! pr ed wi t h ins t ri.ta n t re:4 hut s ehich -nuld i ndi c at e the pro. ace of this sitestion, in addition, we have numercus alar:s which -ould be ectt ted at various tices in the event.
Plant procedures will be revie-ed to assure that the operator sould be prope rly aler t ed to this s it ua t 'on and would take the appropriate action r.ccescary to assure an adequa t e wa f e r supply to the charging penps in the e ent of a tCT evel cc nt rol svstra failure.
S' uld f urt l.er ct ion be r equi r. d as a.esult of ddit icnal NRC cc nce rns, -e sill cr ypraise e,ur positica and inforc you a. c o r s'i ng l y.
Very truly years,
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L 4,;g ((N's's b John DeViacentis Project Manager D O!: see t
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