ML19305E129
| ML19305E129 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 03/18/1980 |
| From: | Moody D Maine Yankee |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-03, IEB-80-3, NUDOCS 8004230005 | |
| Download: ML19305E129 (2) | |
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ENGIN:ERING OFFICE WESTBORO, MASSACHUSETTS 01581 617-366-9011
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March 18,1980 B. 4.1.1 WMY 80 53 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, PA 19406 Attention:
Mr. Boyce H. Grier, Director
References:
(a) License No. DPR-36 (Docket No. 50-309)
(b)
IE Bulletin No. 80-03, dated February 6,1980
Subject:
Charcoal Adsorber Cell Integrity
Dear Sir:
As requested in your letter, Reference (b), the charcoal adsorber cell integrity was evaluated at Maine Yankee. All the charcoal cells utilized at Maine Yankee are manufactured by either Mine Safety Appliances (MSA) or Nuclear Consul ting Services, Inc. (NUCON), and are Type II (panel or tray-type) adsorber cells made to the specifications of MSA Part Number ASK-1743-1552.
The following systems were evaluated:
PAB/ Fuel Building Exhaust (FL-14)
Waste Gas Discharge System (FL-17A & B)
Control Room Recirculation (FL-51 A & B)
Control Room Breathing Air (FL-49A & B)
PAB/ Fuel Building Deep Bed Charcoal ( FL-81 )*
Containment Purge Deep Bed Charcoal (FL-78)*
Inspection Resul ts The adsorber cells of FL-14 and FL-17A & B vere all visually inspected as described in the section 5 of ANSI-N510-1975.
There was no evidence of loose charcoal on the floors of the filter housings or on adjacent surfaces of the
- These systems do not contain Type II adsorber cells.
8 0 0 4 e s ocx6
United States Nuclear Regulatory Commission March 18,1980 r
Attn:
Mr. Boyce H. Grier, Director Page 2 adsorber cells.
Therivetspacingwascheckedandconformedtothe3-5[8" called for in the manufacturer's prints.
There was no evidence of any screens sagging away from the casing between rivets, and no visible deformation of the fil ter housing that could resul t in a loss of charcoal or channeling around the adsorber cells.
The adsorber cells of FL-51 A & B and FL-49A & B were leak tested on January 9,1980 by NUCON. At that time a visual inspection was performed in accordance with ANSI-N510-1975.
The inspection performed showed no indication of cell or housing degradation.
FL-81 and FL-78 contain deep bed charcoal adsorber sections.
These units were visually inspected to answer the concerns of IE Bulletin No. 80-03.
The charcoal adsorber section contains vertical deep beds of impregnated (4") and non-impregnated (1") charcoal.
The screens are steel sheets with 1/16" holes covering about 40% of the surface area.
The screens are spot welded to the structural members with a weld every 1.5 inches.
FL-81 was also inspected and leak tested by NUCON on January 10, 1980.
There was no visible charcoal or charcoal fines in the inlet channels, outlet channels, on the floor of the chamber between the charcoal bed outlets and the HEPA filters, or on the upstream surfaces of the HEPA fil ters.
There were no visible deformities in any filter housing structural members.
As a result of the above investigation, we conclude that the adsorber cells at Maine Yankee will perform as designed during a postulated accident and provide an adequate margin of safety.
We trust this information is satisfactory, and plan no further action at this time.
Very truly yours, MAINE YANKEE ATOMIC POWER COMPANY o
D E. Moody ~
fpp I
Manager of Operations JGP/jgh Director, Division of Fuel Facility cc:
and Materials Safety Inspection
.