ML19318A634
| ML19318A634 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 06/04/1980 |
| From: | Ohanlon J ARKANSAS POWER & LIGHT CO. |
| To: | |
| References | |
| ANO-80-2-0520, ANO-80-2-520, NUDOCS 8006230530 | |
| Download: ML19318A634 (2) | |
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ARKANSAS POWER & LIGHT COMPANY Arkansas Nuclear One Russellville, Arkansas June 4, 1980
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ANO-80-2-0520 Mr. K. V. Seyfrit, Director Office of Inspection & Enforcement, Region IV United States Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 j
SUBJECT:
Arkansas Nuclear One - Unit Two Reportable Event No. 50-368/80-037
\\
Dear Sir:
j This letter is to confirm the conversation between Mr. Bill Johnson, ANO NRC I&E Resident Inspector, and Mr. Basil Baker, Arkansas Nuclear One Operations Superintendent, of 09:40, June 4, 1980. This is reported in accordance with Unit Two Technical Specification 6.9.1.8.b.
)
At 15:40, 6-3-80, "C" Safety Injection Tank boron concentration was reported as being 1711 ppm, less than the minimum allowable concentration required by T.S.
3.5.1.c.
Action was taken at 16:00 to return the "C" Safety Injection Tank concentration to within limits.
At 16:20, 6-3-80, "D" Safety Injection Tank was also reported having boron concentration out-of-specification (1719 ppm), placing the unit outside the least conservative aspect ot the Tech. Spec. LCO's.
At 16:23, same date, "C"
Safety Injection Tank boron concentration had been adjusted sufficiently to be within Tech. Spec. tolerances. Later sampling results reported a concentration of 1771 ppm boron in "C" Safety Injection Tank.
"D" Safety Injection Tank boron concentration adjustment was initiated at 19:30, and was adjusted sufficiently to be within specifications at 19:43. Later sampling and analysis confirmed "D" Safety Injection Tank baron concentraton at 1757 ppm boron.
b<t 8006280 E30 MEMBEA MCCLE SOUThe UTiuT1ES SYSTEM
s K. V. Seyfrit June 4, 1980 ANO-80-2-0520 i Page 2 No cause_of the out-of-spec condition could be immediately verified; no level changes have occurred on the two Safety Injection Tanks since the previous boron
- sample and ' analysis which indicated both Safety Injection Tanks within specif
- . cations.
It appears boron stratification may be occurring within the tanks.. Investigation of the incident, its causes and long-term resolution is continuing.
Sincerel',
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J. P.
Hanlon d' General Manager JPO:BAB: der cc:
J. M. Griffin.
D. C. Trimble a
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