ML20079N524

Ro:On 831222,insp of Containment Vessel Sump Found 3.7 Cm of Water Below Elevation 765 ft-8 Inches.Caused by Condensation on Inside Walls of Containment Vessel Above Elevation 812 Ft.Sump Pumped Successfully

ML20079N524
Person / Time
Site:	Saxton File:GPU Nuclear icon.png
Issue date:	12/30/1983
From:	Cindy Montgomery SAXTON NUCLEAR EXPERIMENTAL CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
SNEC-118, NUDOCS 8401300251
Download: ML20079N524 (3)

Text

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uE SAXTON NUCLEAR EXPERIMENTALCORPORATION

, OENERAL P U B LIC U TI LITI ES SY S TE M SNE Jsasty CENTnAL Powan a LieHT COMPANY PENNSYLVANIA ELECTRIC COM PANY

\ METROPOLITAM f oISON COMPANY PE JC MAluNe Acontss: 7 tg,nang; 100 INTERPACE PARKWAY 201-263 6500 PARSIPPANY, N.J. 070 54 Docket 50-146 - License DPR 4 December 30, 1983 File No. SNEC-Il8 Director Office of Inspection & Enforcement United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania Gentlemen:

An inspection of the Containment Vessel was conducted on September 22, 1983.

As a result of this inspection, approximately 3.7cm of water was found in the Containment Vessel Sump, below Elevation 765'-8". The water was sampled, and subsequent isotopic analysis of the water confirmed that the concentration of Cs-134, Cs-137, and Sr-90 exceeded the limits of Table II, Col. 2, 10CFR20, for unrestricted release (see Attachment I) and is reportable.

The water in the sump is the result of condensation on the inside walls of the Containment Vessel above Elevation 812'. Condensation is a consequence of the breather pipe which was installed during decommissioning to allow the vessel to breathe with changes in atmospheric temperature. This uater drains -

to the sump from the operating floor level (Elevation 812') via the installed drain system and becomes contaminated by residual radioisotopes contained within the sump. Observations in the Containment Vessel do not indicate, any release path to the environment. The floor of the Containment Vessel at Elevation 765'-8" is dry.

On March 19, 1982, you were informed that the drain pipe carrying water to the sump was cut and capped above the operating floor level with the expecta-tion this fix would stop the flow of water to the sump. However, this fix was not entirely successful in preventing the flow of water to the sump.

Approximately 15 gallons of water accumulated in the sump subsequent to this action. A second mitigative measure was taken to stem further water accumulation in the sump. This action was successful as evidenced by the fact that the water level in the sump dic' not increase. The sump was pumped (approximately 15 gallons) subsequent to the September inspection and a follouup inspection on December 6, 1983, revealed no water had accumulated in the sump. We will continue to monitor the sump in subsequent inspections.

8401300251 831230 PDR ADOCK 05000146 g PDR %W Ill

. Director Office'of Inspection & Enforcement Page 2 December-30, 1983

'Please excuse the delay in filing this report. The delay was due to an oversight andtwe have taken steps to prevent its recorrence, i.e.,

inspections and reportr. have been placed in an action tracking system.

Thank you for your-indulgence.

Very truly yours,

/ -.

[ )//rf C. R. Montgomer President CRM/csk

. Attachment h

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o Attactunent I_

Containment Vessel Sump Water Analysis 10CFR20 Date of Concentration Appendix B Analysis Isotope (pCi/mt) Table II, Col. 2 (pCi/mt) 10/03/83 Cs-134 1.4E-5 9.0E-6 Cs-137 1.3E-3 2.0E-5 Sr-90 2.2E-4 3.0E-7 1

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