ML030780075
| ML030780075 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 10/29/2002 |
| From: | Weber D Nuclear Management Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2003-0094 | |
| Download: ML030780075 (2) | |
Text
PAOF* 1 ClCt FACSIMILE of NRC FORM 361 U.S NUCLEAR REGULATORY COMMISSION (12-2000) OPERATIONS CENTER Point Beach Nuclear Plant 3 331>
EVENT NOTIFICATION WO SHEET _ EN# /
NRC OPERATION TELEPHONE NUMBER: PRIMARY - 301-816-5100 or 800-532-3469% 50 or 800-449-3694*
(2 301-415-0550 and [3r] 301-415-0553 *Licensees who ma Sare vlded these telephone numbers NOTIFICATION TIME POINT BEACH UNIT NAJ OFCAI.*R CALL BACK #
liLt &5T" NUCLEAR PLANT 1 &2 CAL-- 9b-5-7 EVENT TIME & ZONE EVENT DATE POWERIMODE BEFORE POWER/MODE AFTER 1025 CST 10/29/2002 100% / Mode 1 100% / Mode 1 EVENT CLASSIFICATIONS 1-Hr. Non-Emergency 10 CFR 50.72(b)(1) (v)(A) Safe S/I Capability AINA GENERAL EMERGENCY GEN/AAEC TS Deviation ADEV (v)(B) RHR Capability AINB SITE AREA EMERGENCY SIT/AAEC 4-Hr. Non-Emergency 10 CFR 50.72(b)(2) (v)(C) Control of Rad Release AINC ALERT ALE/AAEC (i) TS Required S/D ASHU X (vX(D) Accident Mitigation AIND UNUSUAL EVENT UNU/AAEC Civ)(A) ECCS Discharge to RCS ACCS (xii) Offsite Medical AMED 50 72 NON-EMERGENCY (see next columns) (iv)(B) RPS Actuation (scram) ARPS (Xiii) Loss Comm/AsmtrResp ACOM PHYSICAL SECURITY (73 71) ODDO (xa) Offsite Notification APRE 60-Day Optional 10 CFR 50.73(a)(1)
.-&ATZRIAUEXPCZU.E- . ., -'," 'B.rh "-Hr:Nbit, , i10OFR .- : 2() - -- -- I---- kv.Y-d Sp-.*.*ed S'ste.-i Act-tor- -,AINV FITNESS FOR DUTY , HFIT (i)(A) Degraded Condition ADEG Other Unspecified Requirement (identify)
OTHER UNSPECIFIED REQMT (see last column) (i)(B) Unanalyzed Condition AUNA NONR INFORMATION ONLY NNF J iv)(A) Specified System Actuation AESF NONR DESCRIPTION Include Systems affected. actuations and their Initiating signals, causes, effect of event on plant, actions taken or planned. etc. (Conhnued on back)
Reviewed by*,*AJ GI/
9
- 7 <'7iIIp Time At 10:27AM CST, the auxiliary feed water system (AFWS) for the Point Beach Nuclear Plant, Units 1 and 2, was declared inoperable due to the potential for fouling of the minimum recirculation orifices for each of the four AFW pumps. The mechanism identified was the potential for foreign materials in the AFW fluid restricting adequate flow through the flow control orifices in the recirculation line. Under such conditions, it is possible that if the discharge valves for the AFW pumps are throttled, adequate flow may be unavailable through the recirculation line and pump damage could occur.
The potential for this common failure mode was realized while conducting an extent of condition evaluation for reduced recirculation flow observed during surveillance testing of the P-38A motor driven AFW pump on October 24, 2002. The flow was less than expected but above the minimum required for pump operability. Upon disassembly of the P-38A flow orifice we discovered a build up of corrosion products in the orifice.
Both units entered TSAC 3.7.5.E and required action 3.7.5.E.1 which requires immediate steps to restore an AFWS to operable status. Immediate corrective actions have consisted of briefing the on-shift crew (on-coming crews will also be briefed) of the potential consequences of restricted recirculation flow and directing the operators, in the event of a situation requiring AFW flow, to secure a running AFW pump if the pump discharge falls below minimum flow requirements. In addition, information tags have been attached by the AFW pump flow indicators on the main control boards to convey that information.
These actions were completed at 1305 CST. At that time, with these administrative controls in place, we declared the AFWS back in service. Longer term corrective actions, including permanent procedure changes, are being evaluated.
I
,. X NO C, NO (Explain above)
ADDITIONAL INFO ON BACK
- YES X NO PBF-1646 Revision 1 01125/01
ADDITIONAL INFORMATION PAiE 2 OF 2 RADIOLOGICAL RELEASES: CHECK OR FILL IN APPLICABLE ITEMS (specdicdetatlslexplanattonshould be covered in the event description)
LIQUID RELEASE GASEOUS RELEASE UNPLANNED RELEASE PLANNFD RELEASE ONGOING TERMINATED MONITORED UNMONITORED OFFSITE RELEASE T S EXCEEDED RM ALARMS AREAS EVACUA -D PERSONNEL EXPOSED OR CONTAMINATED OFFSITE PROTECTIVE ACTIONS RECOMMENDED State release path n desa'pflon Release Rate (CUsec) % T. S. Limit HOO GUIDE Total Activity (Ci) % T. S. Limit HOD GUIDE Noble Gas 0 1 Cilsec 1000 CI Iodine 10 uCilsec 0 01 Ci Particulate I 1 uClsec _ 1 mCi Liquid (excluding trrbum I 10 uC/mm i 0 1 Ci and dissolved noble gases) I Liquid (trtium) 0 2 Ct/mm 5 C, Total Activity I I PLANT STACK CONDENSER/AIR EJECTOR MAIN STEAM LINE SG SLOWDOWN I OTHER RAD MONITOR READINGS I I ALARM SETPOINTS
% T. S. UMIT ('appPhcable) i RCS OR SG TUBE LEAKS: CHECK OR FILL IN APPLICABLE ITEMS: (specific detalls/explanationsshould be covered In event description)
L.OCATtON OF THE LEMAJ(se. SG ,.wt-, pip.. mej LEAK Rate UNITS, gprngpd T. S. UMITS SUDDEN OR LONG-TERM DEVELOPMENT LEAK START DATE TIME COOLANT ACTMVTY PRIMARY SECONDARY AND UNITS'
'LW.T CI' SA~FTY EAE Oi r TtTO r- -. -,..
EVENT DESCRIPTION (Continued trm front)
PBF-1646 Rcvision I 01/25/01