05000353/LER-2002-002, Manual Scram Due to Failure of Main Condenser Air Removal System
| ML022750354 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 09/23/2002 |
| From: | Levis W Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER-02-002-00 | |
| Download: ML022750354 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded |
| 3532002002R00 - NRC Website | |
text
ExelkrnM Exelon Nuclear wwwexeloncorpcoM Nuclear Limerick Generating Station PO Box 2300 Sanatoga, PA 19464 1 OCFR50.73 September 23, 2002 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Limerick Generating Station, Unit 2 Facility Operating License Nos. NPF-85 NRC Docket Nos. 50-353
Subject:
LER 2-02-002, Unit 2 Qffgas Hydrogen Analyzers Inoperable This LER reports a condition prohibited by the Technical Specifications in that a grab sample of the Unit 2 offgas system was not obtained within the time limit required by Technical Specifications Section 3.3.7.12, Action 110 with the hydrogen analyzers inoperable.
Report Number:
2-02-002 Revision Number:
00 Event Date:
July 24, 2002 Discovered Date July 24, 2002 Report Date:
Sep.23, 2002 This LER is being submitted pursuant to the requirements of 10CFR50.73(a)(2)(i)(B).
If you have any questions or require additional information, please do not hesitate to contact us.
Sincerely, William iL-vis9 Vice President - Limerick cc: H. J. Miller, Administrator Region I, USNRC A. L. Burritt, USNRC Senior Resident Inspector, LGS
NRC FORM 366 U.S. NUCLEAR REGULATORY APPROVED BY OMB NO. 3150-0104 EXPIRES 6-30-2001 (1-2001)
COMMISSION Estimated burdenper response to complywith this mandatoryinformation collection request 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> Reported lessons leamed are incorporated into the licensing process and fed back to industry Send comments regarding burden estimate to the Records Management Branch TT-S E6), U S Nuclear Regulatory Commission, Washington, DC 20555-0001, or by intemet e-LICENSEE EVENT REPORT (LER)InomtnadReutryAfis mal to bisi @nrc gov, and to the Desk Officer, Office of 1nformation and Regulatory Affairs, NEOB-1 0202(3150-0104), Ofice of Management and Budget, Washington. DC 20503 If a (See reverse for required number of means used to impose inormaton collecton does not display a currently valid OMB control digits/characters for each block) number, the NRC may not conducl or sponsor, and a person is not required to respond to, the FAClI [TY FJAMF II nflOCKFT NIIMRFR 0I PArF (3}
Limerick Generating Station, Unit 2 l
05000 353 1 OF 3 TITI F (4A Manual Scram due to Failure of Main Condenser Air Removal Sys em EVENT DATE (5)
LER NUMBER (6)
REPORT DATE (7)
OTHER FACILITIES INVOLVED (8)
I IFACILITY NAME DOCKET NUMBER MO DAY YEAR YEAR NUMBER NO MO DAY YEAR 05000 FACILITY NAME DOCKET NUMBER 7
24 2002 2002 - 002 -
00 9
23 2002 05000 OPERATING THICRFPORTIC Ci I~rrrMFnPIIRI IANTTATIF RFnilIRFMFNT nF inr FRSF (r.hptknIthAt nniv) (Ill MODE (9) 1 20 2201(b) 20.2203(a)(3)(ii) 50.73(a)(2)(ii)(B) 50 73(a)(2)(ix)(A)
_ POWER 20 2201(d) 20.2203(a)(4) 50 73(a)(2)(iii) 50 73(a)(2)(x)
LEVEL (10) 100 20 2203(a)(1) 50.36(c)(1)(i)(A) 50 73(a)(2)(iv)(A) 73 71(a)(4) 20 2203(a)(2)(i) 50.36(c)(1)(ii)(A) 50.73(a)(2)(v)(A) 73.71 (a) (5) 20 2203(a)(2)(ii) 50.36(c)(2) 50 73(a)(2)(v)(B)
OTHER in Abstract below or in 20 2203(a)(2)(iii) 50.46(a)(3)(ii) 50 73(a)(2)(v)(C)
NRC Forrm 366A 20 2203(a)(2)(iv) 50.73(a)(2)(i)(A) 50 73(a)(2)(v)(D) 20 2203(a)(2)(v) x 50.73(a)(2)(i)(B) 5073(a)(2)(vii)
=
20 2203(a)(2)(vi) 50.73(a)(2)(i)(C)
_ 50 73(a)(2)(vii)(A)
________________j____
20 2203(a)(3)(i) 50.73(a)(2)(ii)(A) 50 73(a)(2)(viii)(B)
K LICENSEE CONTACT FOR THIS LER (12)
NAME TELEPHONE NUMBER (Include Area Code)
M. C. Kaminski, Manager - Regulatory Assurance (610) 718-3400 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)
COMPONEN MANU-REPORTABLE CU ST COPNET MANU-REPORTABLE l CAUSE l
SYSTEM l
T lFACTURER l
TO EPIX CUE l
SYSTEM lCOMPONENT lFA CTURER l
TO EPIX l
A
_ _ _ _ _ __l SUPPLEMENTAL REPORT EXPECTED (14)
EXPECTED I MNTH IDAY YEAR SUBMISSION.S-YES (If yes, complete EXPECTED SUBMISSION DATE).
X NO DATE (15) 4 AR.RTPAO'T (I imit tIn 1 Annf
- - qnnrt I A
,nnrnyimntAlv 1 9; qinnlA-qnqr.Ad turinwriftAn linA-, (I Al~
On July 24, 2002 at 00:26 hours during unit shutdown, all three Unit 2 Main Condenser Offgas Hydr-gen-Q_
zers were placed in purge mode, with the steam jet air ejectors in service, without compensa-tory sarrFlng In place.-This co-ndition represented Pavioldtid-n ofTTechnical Specifications 3.3.7. The cause of this event was that shift management allowed all three H2 analyzers to be purged without compensatory sampling in place, based on incorrect assumptions of future plant conditions. Corrective actions included restoring an analyzer to operable status, making appropriate revisions to the affected procedures, and reviewing the event with Operations and Instrument and Controls (I&C) departments.
NRC FORM 366 (1-2001)
(If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A) (17)
Analysis of the Event
The actual consequences of this event were minimal. There was no release of radioactive material to the environment. The offgas system operated as designed during shutdown operation. A hydrogen analyzer was restarted approximately 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> after being secured.
Grab samples of offgas confirmed that the hydrogen concentration was a small fraction of the Technical Specification 3.1i.2.5 limits.
The potential consequences of this event were also minimal. In the event that hydrogen had exceeded the limit of 4% as specified in Tech Specs, the required action would have restored the concentration to less than 4% within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.
Cause of the Event
The cause of this event was that the shift management allowed all H2 analyzers to be placed in purge without compensatory sampling in place based on assumed future plant conditions.
Corrective Action Completed The following corrective actions have been completed:
The Unit 2 common offgas hydrogen analyzer was immediately restored to operable status following condition discovery, and a hydrogen sample was taken.
Plant procedures have been revised to specify the operable/inoperable hydrogen analyzers when testing and removing SJAE/offgas hydrogen analyzers from service.
Operations and Instrument and Control personnel have been briefed on this event including proper communications.
Previous Similar Occurrences LER 1-99-006 In that event, all offgas analyzers were left in purge and not put in service when bringing on the SJAE during plant startup. This was attributed to operator error.