05000304/LER-1985-026, Corrected LER 85-026-00:on 851108,discovered That Spring Loaded Check Valves Installed Backwards on Drain Lines for Reactor Containment Fan Cooler Motor HX Housings.Effect on Drainage Being Studied

Corrected LER 85-026-00:on 851108,discovered That Spring Loaded Check Valves Installed Backwards on Drain Lines for Reactor Containment Fan Cooler Motor HX Housings.Effect on Drainage Being Studied

ML20136G616
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	12/06/1985
From:	Harrsch R COMMONWEALTH EDISON CO.
To:
Shared Package
ML20136G609	List: 05000304/LER-1985-026, Corrected LER 85-026-00:on 851108,discovered That Spring Loaded Check Valves Installed Backwards on Drain Lines for Reactor Containment Fan Cooler Motor HX Housings.Effect on Drainage Being Studied
References
LER-85-026-06, LER-85-26-6, NUDOCS 8601080366
Download: ML20136G616 (2)

LER-2085-026, Corrected LER 85-026-00:on 851108,discovered That Spring Loaded Check Valves Installed Backwards on Drain Lines for Reactor Containment Fan Cooler Motor HX Housings.Effect on Drainage Being Studied

Event date:
Report date:
3042085026R00 - NRC Website

text

_ - - _ ..

g i LICENSEE EVENT REPORT (LER)

Facility Name (1) Docket Number (2) Page (3)

Zion. Unit 2 015101010131014 1lof!0l2

• Incroperly installed check valves in Reactor Containment Fan Cooler Motor Heat Exchanger Housing Drains Event Date (5) LER Number (6) Report Date (7) Other Facilities Involved (8)

Sequential Facility Names l Docket Number (s)

Month Day Year Year fff

/// Number J/f

///

Revision Month Nunber Day Year 0151010101 l l 1l2 0l6i 81 5

~~~ -

11 1 01 8 81 5 81 5 0l2l6 010 01 51 01 01 01 l l OPERAT E THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10CFR MODE (9) 6 20.402(b). _ 20.405(c) _ 50.73(a)(2)(iv) _ 73.71(b)

POWER _ 20.405(a)(1)(i) _ 50.36(c)(1) _ 50.73(a)(2)(v) _ 73.71(c)

LEVEL g i _ 20.405(a)(1)(li) _ 50.36(c)(2) _X_ 50.73(a)(2)(vii) _

Other (Specify (10) 0 I Ol 0 _ 20.405(a)(1)(iii) _ 50.73(a)(2)(i) _ 50.73(a)(2)(viii)(A) in Abstract below

/,/,'/,//,/,/,/,/,///,///,//////////,/ _ 20.405(a)(1)(iv) _ 50.73(a)(2)(li) _ 50.73(a)(2)(viii)(B) and in Text)

'//jj/'j'

// /j/,/

'j/' 'j f/f j/'/ ///// //j/

/ / _ 20.405(a)(1)(v) _ 50.73fa)(2)(iii) _ 50.73(a)(2)(x)

LICENSEE C0dTACT FOR THIS LER (12)

Name TELEPHONE NUMBER AREA CODE Rob Harrsch. Technical Staff Engineer 3l1l2 71 41 61 -l 21 01 814 COMPLETE ONE LINE FOR EACH COMPON FAILURE DESCRIBED IN THIS REPORT (13)

CAUSE SYSTEM COMPONENT MANUFAC- REPORTABLE CAUSE SYSTEM COMPONENT MANUFAC- REPORTABLE TURER TO NPROS TURER TO NPRDS B BlK I l lV 51 41 31 2 Y l l l l l l l l 1 l i I I I I I I I l l l SUPPLEMENTAL REPORT EXPECTED (14) Expected Month l Day l Year Submission

1. (

X lyes (If yes, conclete EXPECTED SUB"!SSION DATE) l NO Ol1l116 81 6 ABSTRACT (Limit to 1400 spaces, i.e, approximately fifteen single-space typewritten lines) (16)

On Noventer 8,1985 while perfonning Environmental Qualification (EQ) inspections of the Unit 2 Reactor Containment Fan Cooler (RCFC) frators, it was observed that spring loaded check valves were installed backwards on the drain lines for the RCFC motor heat exchanger housings. Check valves, installed in this direction, would prevent drainage of the described housings. This condition was obseived on all 5 Unit 2 l .RCFC's. Unit 2 was in a refueling mode at this time.

A subsequent inspection on all Unit 1 RCFC's found all check valves installed in the proper direction, allowing water to drain from the housings.

I Station Nuclear Engineering Department (SNED) is presently investigating what effect the backwards check valve has on the cperability of the RCFC motor. A supplemental report will be issued when the results of SNED's investigation are received.

neutueu366 831230 4 ADOCK 050 l gDR 01500 l

1

.Y' LICENSEE EVENT REPORT (LER) TEXT CONTINUATION i FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) Page (3)

Year ///

fjj Sequential //j/, Revision f

/// Nunter /// Nunt li Zion. Unit 2 0 l 5 1 0 1 0 1 0 l 3l 01 4 8l5 -

0l216 -

01 0 01 2 0F 01 2 TEXT On Fovember 8,1965 while perfonning environmental qualifications inspections of the Unit 2 Reactor Containment Fan Cooler (RCFC) motors, it was observed that spring loaded check valves were installed t ti.kwards on the drain lines for RCFC motor heat exchanger housings. Check valves installed in this c *rection would prevent water from draining out of the heat exchanger housing. This condition was observed on all 5 of the Unit 2 RCFC's. Further investigation of the housings found small amounts of standing water (appro n ately 1/2" depth) in 2 of the 5 RCFC's. At the time of this inspection, Unit 2 was in the refueling mode.

Based upon the inspection of the check valves and a review of RCFC records, it appears that these valves have been installed in this manner since the RCFC's were first installed. The RCFC motors have never been inoperable due to problems associated with either these valves or motor heat exchanger housing drainage.

Additionally, the RCFC motors have experienced no pressure transients or exposure to high moisture e'nvironments which could cause excessive amounts of water-to condense in the housings.

A subsequent investigation on all Unit 1 RCFC motors found all check valves to be installed in the

_ proper direction, allowing water to drain from the housings.

Station Nuclear Engineering Department (SNED) is investigating what effect the backwards check valve has on the operability of the RCFC motor. A supplemental report will be issued when the results of SNED's investigation are received.

f 01500

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