ML19337A670

Final Interim Deficiency Rept Re MSIV Leakage Control Sys E32 Being installed.E23 Equipment Cannot Meet Functional Requirements to Relieve Steamline Pressure.Mods Being Implemented & Will Be Completed Prior to Fuel Load

ML19337A670
Person / Time
Site:	LaSalle
Issue date:	09/19/1980
From:	Delgeorge L COMMONWEALTH EDISON CO.
To:
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8009290399
Download: ML19337A670 (2)

Text

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Commonwzith Edison 6 one Fast Nabon:1 Plata. Chicaco. lihnos -

Accress Reply to: PoFOihce Box 767 Chicago, Ilknois 60690 September 19, 1980 Mr. James G. Keppler, Director Directorate of Inspection and Enforcement - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

LaSalle County Station Units 1 and 2 MSIV Leakage Control System -

Final Report - 10 CFR 50.55(e)

NRC Docket Nos. 50-373/374 Reference (a): Telecon T. Watts (CECO.) to J. Niesler (NRC-RIII) dated August 22, 1980.

Dear Mr. Keppler:

Commonwealth Edison notified your office on August 22, 1980 System (E32) (a))

(Reference of a possible deficiency in the MSIV Leakage Control being installed on LaSalle County Units 1 and 2. This condition indicates a potential that the inboard E32 equipment cannot meet functional requirements to relieve steamline pressure <

(to atmospneric) and to measure and convey bleed-of f leakage to an I acceptable discharge path. A potential exists that the entire MSIV-LCS is invalidated if this condition is not corrected.

Deficiency - The depressurization-chase drainline is not located at the piping system low point, which is at the heater section, hence condensate could be present in the process line after depressurization. This could result in

-- an excessive flow indication during the bleed-of f phase

- -- - -- - -- ( af ter the 3-minute time r runs out) . If slug-flow occurred through the flow-meter an erroneous isolation would happen to invalidate the entire system function by closing the system isolation valves.

Engineering changes are belnd defined to provide an additional liquid bleed-of f drain-line downstream of the heaters at the system low point.

This drainline will have a check valve to prevent venting and back-flow from the sump into which it drains.

Additionally, the line.

the flG. ineter is being relocated to a high point in These modifications are currently being implemented and will be completed prior to fuel load on the subject units. Because the modifications are in accordance with established design criteria 80092903N 5 g

Commonwerlih Edison Mr. James G. Keppler, Director September 19, 1980 Page 2 defined by the equipment supplier (General Electric), it has been concluded that an unreviewed design issue does not exist.

Therefore, cecause the modificatione merely implement the original design objective this is considered a final report.

It should also be pointed out that the unmodified design though not the optimum is not clearly unacceptable. However, the final integrated design review conducted by General Electric concluded that the modifications de.cribed would be prucent and for that reason those modifications are being made.

If there are any questions in this regard, please direct them to this of fice.

Very truly yours,

. c o L. O. DelGeorge Nuclear Licensing Administrator cc:(1) Mr. R. Walker (NRC-RIII)

Resident Inspector - LSCS (2) Director of Inspection & Enforcement /

(Wash., DC) 6808A

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