ML19326B403
| ML19326B403 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 10/06/1974 |
| From: | Phillips J ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19326B395 | List: |
| References | |
| NUDOCS 8004150769 | |
| Download: ML19326B403 (2) | |
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L W iM Ch#cd M MESMs M e h h[ad e DDPDCATE DE TELEPH AAE034C t t00)(2-005857E279)PD 10/06/74 1100 gpy ICS IPMMTZZ CSP 581372431T RELAY TDMT LITTLE ROCK AR 10-06 IISet. EDT PMS 2-837290E277 18-04 0457P EDT, WUK MR NORMAN C MOSELEY DIRECTOR CARE UNITED STATES ATOMIC ENERGY COMMISSION DIRECTORATE OF REGULATORY OPERATIONS REGION 11' 238
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PEACHTREE ST NORTHWEST SUITE 818 ATLAUTA GA 30303 SUBJECT ARKANSAS POWER AND LIGHT COMPANY ARKANSAS NUCLEAR ONE UNIT I DOCKET NUMBER 50-313 LICENSE NUMBER DPR-51 ABNORMAL OCCURRENCE lj?p-REPORT NUMBER 58-313/74-8 FOLLOWING A REACTOR / TURBAN TRIP TEST AT 1415 HOURS ON OCTOBER 31974 AN INVESTIGATION WAS MADE To pj
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DETERMINE THE REASON FOR DISCREPANCIES BETWEEN READINGS ON 10RE 1
FLOOD TANK LEVEL INDICATION, INSTRI; MENTATION WAS GIVING AN INCREA ING
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LEVEL INDICATION FOR SEVERAL DAYS, INDICATING RCS IN-LEAKAGE.
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COOLANT HAD BEEN REMOVED FROM BOTH TANKS TO STAY WITHIN-TECH
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i SPEC LIMITS OF 13 FEET PLUS MINUS 0 PLUS 4 FEET. LEVEL TRANSMITTER ON BOTH TtNKS WERE FOUND TO HAVE LOST LIQUID FROM THE REFERENCE LEGS CAUSING INSTRUMENTATION TO DRIFT HIGH, GIVING A FALSE LEVEL INCREASE INDICATION. WHEN REFERENCE lea 5 WERE PROPERLY ESTABLISHED-l THE CORE FLOOD TANK A LEVEL WAS FOUND TO BE 12.4 FEET WHICH c.l IS S.2 FEET LOWER THAN TECH SPEC LIMIT.
.. %.; yg_.g.,.s.g3p.g;..y,Q g_ :2353:yp g_ }., (.. m.. g...l y f & _. YU [; a. y i " @ i @ @ I M ducz9 h S I NI T 5?5?5 5 5% J M d2 IR E 55 ) l REASONS FOR LOSS OF LIQUID FROM THE REFERENCE LEGS ARE STILL BEING EVALUATED, ALTHOUGH EVAPORATION AND LEAKAGE APPEAR TO i BE THE ONLY POSSIBILITY. SAFETY IMPLICATIONS WERE THAT INSUFFICIENT VOLUMM EXISTED IE CORE FLOOD TANK A FOR PROPER OPERATION OF i ) THE CORE FLOODING SYSTEM. ACTION TO BE TAKEN Y 1 FURTHER RESOLVE THE ABOVE IS: I. MAKE CHl;CK EVERY TWO DAi, AEFERENCE LEGS FOR ONE WEEK 3 THEREAFTER l CNCE A ifEEK UNTIL hM RESOLVED. 3. EVALUATE THE NEED FOR i. N. A m D ..J W n' D .T,! _{"s a s1201 (RS #) 7~_ r w y g m.5 x w m. m#~m w.m ' " J:55 ri Ri%<* *:w;.s y.d3g y q p p w:...s m qpq w% Q h YE ~ "i%2-.. 'QARW QWSN E' ; YU h M Q N g: w ; m m g. W y a $ (f k g g y & u $ f h b j A M N$$ M3 8Jh; 5 n a x-mn k c zx&#%%wi sra.mg.sumingsg-i ADDITIONAL OR REPLACEMENT -INSTRUMENTATION, BUT OF THE DRY LEG TYPE AND OF PERHAPS e NARR0 DER RANGE. 3. NOT DRAIN OUT ANY WATER FROM THE CORE. FLOOD TANKS UNTIL LEVEL TRANSMITTER CHECK HAVE BEEN MADE. 4. VERIFY PROPER VENTING PROCEDURE TO ASSURE REMOVAL OF POSSIBLY ENTRAPPED NITROGEN. I J D PHILLIPS SENIOR VICE PRESIDENT AUhANSAS POWER AND LIGHT COMPANY NNNN -}}