ML19259B943
| ML19259B943 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/12/1979 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7906040034 | |
| Download: ML19259B943 (2) | |
Text
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@N PitI1/DElflita EI.ECT AIC Cf *F m Peach Bot t en At cei c Powe r St at i m Delta,' Pennsylvania
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17314 Ap ri t 12 1979 M r.
Boyce H. Grie r Office of Inspection and Enforcement MS DOCUMENT CONTAWS Un 1 St at u, clear Regulatory Coosalss im POOR Q' aUTY PAGES J
631 Park Aver s Kin g o f Prus s ia. PA 194U6 SJaJECT:
REPORTABLE OCCUP9ENG - FROTT NUT IFIr.fT!lh C.m 'i rwi n g W. T. Ullrich's c<nve rs at im wit h '4r. Gremam. Fegim I. United St at es N uc l ea r Re gu l at o ry Cownti s s i gt. en 1/12/~9.
'e fe ren ce :
Docket No. 50-277/275 Peach Bott en Unit s 2 and 3 Technical Speci ficatim Peference :
6.9.2.a(9)
Repo rt No. 2-79-16/IP Occurrence Date:
Apri l 11, 1979 Iden t i fi c at i on of Occu rren ce :
Enginee rin g rev iew of plant valve lin e-ups indicated the sei smir. ally quali fi ed Emergency Se rvice tiater (ESW) s yst e st was no r:.a lly econ ect e d t o a he at exchwger in a non-sei smically qualified system (RBCCh).
An Engineering review determined that the valving associated with the E5W supply t o t he R BCCW s ys t em wa s n o rma l ly a l i gn ed in t h e ope.
position.
This Prev idad a supply of ESW to the RBCCW sy stem during a losa n f cut s ide powe r cmd it i on enthout ope rat or act ion. The energency se rvice wat er syst e i is a seisstently quali fied systen.
Reactor Stilding cooling wate r sy st em is n et requi red t o N-seismically qualified.
The manual valve line-up, t ha r-f ar=. emld hue r*
- u l t e d in leakage from the emergency service water syst em if a **i awie evm' ra g u t t ed in failure of a RBCCh heat e xch an ge r.
Appa rent C.aus e o f Oc cur ren ce:
The FSAR in d ic a t e s that the re act o r *= d i d e g e i n = e d e rm l in g wit a r a v st e re-ain s ope rat le during a loss o f powg r t r an s ient in o rde r t o s upp l y c ac ! tn g w at e r t o in -cont ainm t cowpment s durin g such a t ran si ent.
The heat e xchts ca r is pr9vided with energency s e rvi ce w ate r du ri n g t h i s pe ri &i tinca normst **rvice
= at e r ptamps are not fe d frce ene rg en c y his e s.
The FSAP. d-=
ent a d.* r= = = tc the seisms c quali ficatims o f t h e R BCCW s y s t e n.
P l ant st sff in t errect l y a = = tsa e d the reactor bailding closed cooling water syste= wa=
= e i = = t <; a l l y q ua l s t'i e d.
P rocedu re5 we re t he re fore writ ten to reduce manual s a lv in g cparat im e follming loss of power t ransient.
This r*sulted in a valve lineup wht(h spectfied that 7
006 01 Oc'
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t he ene rgenc'r servtce wate r s *Isce t>
an d f ra r a w 'r
', t i ' l l
,s. ricaad emling wat er heat e xch ar ge rs be epened durinq normal p Isrt o p e r i f t e v' *.
,%1alysis of Occurrence:
Significance of this systen Line-up is considered minim t bs**d m the low probability of a seissie event.
Addi tim al ly, fellowing a seismic event,
ope rat o r act Lon cas td h ave been taken in sufficient tiv to maint ain the if a leak cccurred ope rabilit y of the e e-rgm e y s e rv ic e wat e r sy
- t e-e ven in the reactor building closed cooling wat er beat exc h ar ge r.
Correct ive 4 tion:
~
E4 valves emnect in g Val e line -ups wa re jawdi at ely ras t igr ed such t hst t o t he 'A NIW heat e u ch vi te r we r=
in the elmed pos it im.
In fo r a t i ce sessiorts were held with shi ft op e rat o r s.wi d t e v e ra ry t a g < placed in the cont ro l reem t o en s u re p rop e r ope r at n r respon s - daring s to= = of pma r t r an s i m t.
levig tern co rrect i v e 3ct i m wiil involve ravi-w and rev ha s m o f v a r ious.
na t ftsict im p rocedu re s, ope rat icecil t ran s ient y rocedure and s y st em check -of f list.
Since the original ralva lin e-up is p re fe rab t, t he RRCCW system will be s eismic evmt.
Pa**d en this an aly z e d t o det e r-in e it s pe rf e rnan c e du r in g a r-t urn t o the orig in a l review, plant nodificat im may be made to parmi t a
operat ind mode.
P re v ious Failures:
Nme sini t ar.
Very t r'ily y ou rs,
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