ML20030C136
| ML20030C136 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 03/06/1981 |
| From: | Mcgaughy J MISSISSIPPI POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, AECM-81-94, NUDOCS 8108250427 | |
| Download: ML20030C136 (3) | |
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MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 16 4 0. J A C K S O N. M I S S I S S I P P I 3 9 P,.0 5
,.3-JAMES P. McGAUGHY, JR.
AS$i$ TANT VICF 8*F$1 DENT March 6, 1981 fI t~
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N U. S. Nuclear Regulatory Commission
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Attention:
Mr. J. P. O'Reilly, Director 3,/,.
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Dear Mr. O'Reilly:
SUBJECT:
Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-80/32, Final Report, Standby Service Water System Design Condition AECM-81/94 On June 13, 1980, Mississippi Power & Light Company notified Mr. F.
Cantrell, of your office, of a Potentially Reportable Deficiency (PRD) at the l
Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns debris in the Standby Service Water (SSW) basin being picked up by the pumps
, and transfe.rred.into the system.
As previously reported in our AECM-80/153, 7/11/80, we have determined this condition to be reportable undir.10CFR50.55(e). Our investigation into 10CFR21 reporta'ility continues. At ached is our final report.
o Yours truly, I
J. P. McGaughy, Jr.
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See page 2 1
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0108250427 810306
{DRADOCK 05000416 Member Middle South Utilities System
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MISSISSIPPI POWER & LIGHT COMPANY Mr. J. P. O'Reilly AECM-81/94 NRC Page 2 cc:
Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner 4
Mr. Victor Stello, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 I
Hattiesburg, MS 39401' 1
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Attachment to AECM-81/94 Page 1 of 1 FINAL REPORT TO PRD-80/32 I.
Description of the Deficiency The constrs.ctor discovered that daring flush of the Standby Service Water (SSW) System, the pumps caused debris to be picked up and transferred into the SSW system.
Investigation revealed that the design prmitted debris to enter the SSW basin from the surrounding area.
Debris could potentially accumulate and clog heat exchangers in safety related systems serviced by the SSW system and/or restrict orifices in -
the SSW System piping which services safety relatod equipment. Examples of safety related systems serviced by the SSW system are the RHR heat exchangers, the HPCS, RHR, & LPCS pumps bearing coolers, the HPCS Diesel
- Generator Cooler,. _and the Standby. Diesel Generator Cooler.
This item has been determined to be related to Grand Gulf Nuclear Station only. All other Bechtel' designed nuclear power plants have a screen on the suction of the SSW pumps.
This deficiency is applicable to both Units 1 and 2.
II.
Analysis of Safety Implications Should debris enter the SSW system and clog the flow patn of the cooling water, the heat exchangers could be rendered inoperable, thus leading to oil overheating, and, ultimately, to bearing and pump failure.
Therefore, a loss of cooling to safety related equipment could occur.
Due to that possible loss of cooling to safety related equipment, we have determined this deficiency reportable under 10CFR50.55(e).
III.
Corrective Actions Taken The deficiency was caused by lack of a designed " filter" system for the j
SSW system.
Our Architect / Engineer did not anticipate the extent to i
which debris would enter the SSW basins at the time they issued the l
design for the SSW system.
As outlined in I. above, this deficiency is limited to GGNS. Corrective actions are to install pump suction screens on the SSW system pumps.
Currently, these screens are being installed, and we anticipate that installation to be completed by April 3, 1981.
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