ML18082A377
| ML18082A377 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 04/11/1980 |
| From: | Schneider F Public Service Enterprise Group |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-03, IEB-80-3, NUDOCS 8005140083 | |
| Download: ML18082A377 (4) | |
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so 051400~3 Frederick W. Schneider Vice President Public Service Electric and Gas Company 80 Park Place Newark, ~07101 201 /430-7373 50 ~ ~');;...
Production Mr. Boyce H. Grier, Director U. S. Nuclear Regulatory Commission Office of Inspection & Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. Grier:
NRC IE BULLETIN NO. 80-03 SUPPLEMENTAL RESPONSE NO. 1 AND 2 UNITS SALEM GENERATING STATION April 11, 1980 Pursuant to our initial response of March 19, 1980, the following supplemental information is hereby submitted for your review which completes the PSE&G effort required by items 1-4 of the subject bulletin.
I.
Erigineering Considerations All charcoal cells employed are manufactured by Mine Safety Appliances Company and are of either the Type I, pleated bed adsorber cells or the Type II, flat bed, tray adsorber cells.
The Type I cells ar.e used in the containment pressure relief, containment iodine removal, and auxiliary building exhaust systems while the Type II adsorber cells are employed in the control room emergency and fuel handling building exhaust systems of both plants, respectively.
The construction of our adsorber cells differs from the identified problem cells in that they are of an all welded construction, using 3/16 11 spot welds on centers ranging between 2-1/2"- and 3/4 11 depending on the type of cell and the location within the cell.
Also the Type II cells employed have integral cross braces between the sides and from the front to the back to prevent frame (housing) separation.
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Mr. Boyce 4/11/80 I I.
Vi'sU:al Tnsp*e*ction Since the construction of No. 2 Unit is effectively complete with all charcoal cells installed and tested, both No. 1 & 2 Units were inspected on the basis of "Power Reactor Facilities with an Operating License."
The visual inspection addressed those items in Appendix A of ANSI N510-1975 which would.directly effect the adsorber cells' capability and reliability in performing their intended function with particular emphasis on A-la, b, c, d, A-2c, d, e, and f.
The visual inspection included both the upstream and downstream side of the cells and emphasized the following additonal items:
- a.
Detection of loose charcoal on the floor of the filter housing and/or on the outside horizontal surfaces of the adsorber cells or internal enclosure members.
- b.
The use of portable lighting to determine if light penetrated through the cell, thereby indicating the possibility of adsorber cell or filter housing deformation, excessive charcoal settling, and/or channeling through the. charcoal.
- c.
The condition and *spacing of spotwelds which secured the screen to the cell housing.
- d.
Deformation of the screening.
- e.
Ruptured or separated screening from the housing.
The visual inspection included a representative number Cat least fivel of cells in storage and all installed Type I and Type lI adsorber cells, except for the Type I cells of the operating No. 1 Unit, Containment Iodine Removal System.
These Type I adsorbei cells were*excluded from the visual inspection sinde:
- 1) they only constituted 21% of all Type I cells in service and,
- 2) no loss of charcoal no~ major deficiericies were found during the inspection of all other Type I adsorber cells.
Mr. Boyce 4/11/80 B.
Obs*erved Condit"ion." *o:r GeTls All Type I and Type J:I adsorber cells inspected were found to be in satisfactory condition ahd without deformation, settling, or loss of charcoal.
The visual inspection did reveal Ol'.l.e item of note.
~ome scattered and sparsely spaced particles (apparently charcoal) were found on adsorber cells or within the adsorber cell filter housing with no visible damage to the adsorber cells.
This is based on observations of from 1 to 12 particles in about 50% of the adsorber cells and, in two particular cases, observing approximately 1 to 2 cubic centi-meters of charcoal on adsorber cell elements (one Type I cell serial #3236 of the Fuel Handling Exhaust System and one Type II cell #38 of the Auxiliary Building Exhaust System).
These conditions are attributed to one or more of the following:
Observed Condition. of Cells
- 1.
Very small particles of charcoal that passed through the screening during shipment and. handling.
- 2.
Fine points of the charcoal particles can protrude through the screen and become visible.
These protruding points either remain fixed within the screen or
- might be dislodged (broken off) by an external force such as a. finger or being jostled during shipping and handling.
- 3.
Residue particles left over from the charcoal cell filling process which then collect at one cent~al point during shipping and hantj.l:tng.
This tends to be confirmed by the" oose.rvation that spare filters in storage had residue
- charcoal in the bottom of the shipping cartons.
In some cases the *particles are too large to have passed through the screening and their presence is attributed to the *residue from filling and packaging.
Mr. Boyce 4/11/80 In addition to our own visual inspection o:f.the adsorber cells, the manufacturer of the cells performed an evaluation based on a recent routine inspection and testing of the No. 1 Unit adsorber cells.
The manufacturer finds that the adsorber cells of No. l Unit are satisfactory.
Also, based on verbal discussions, the manufacturer indicated that finding sofue residue charcoal particles within the shipping cartons and/or on the external surface of the filter is not uncommon and is not a direct indication of a loss of charcoal.
III.* Results Based on the above engineering considerations, the findings of the visual inspection, the evaluation of the findings, and the comments from the manufacturer of the adsorber cells, we believe that the charcoal adsorber cells in use at our Salem Generating Station do not have "a potential for a loss of charcoal incidental to handling, storage or use. 11 If you require any additional information at this time, we will be pleased to discuss it with you.
Sincerely, CC:
Off.ice of Inspection & Enforcement Division of Reactor Operations: Inspection Washington, D. C. 20555 Mr. L. J. Norrholm NRC Resident Inspector Hancocks. Bridge, N.J.