ML20005G373

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LER 89-021-00:on 891211,computer Alarmed Indicating Malfunction of Chlorine Monitors 121 & 122 & Leaving Control Room Ventilation Sys Inoperable for More than 11 H.Caused by Personnel Error.Monitor 122 Returned to normal.W/900111 Ltr
ML20005G373
Person / Time
Site: Prairie Island Xcel Energy icon.png
Issue date: 01/11/1990
From: Hunstad A, Parker T
NORTHERN STATES POWER CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-89-021-01, NUDOCS 9001190068
Download: ML20005G373 (4)
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[ January 11,'1990, 10 CFR Part 50 ' Section 50.73 , J i 

                             ' Director of Nuclear Reactor Regulation                                                           ,

U S-Nuclear Regulatory Commission i Attn: Document Control Desk 

                             , Washington, DC =20555                                                                            ,

PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR 60 'j Both Chlorine Monitors on One Train of Control Room ypntilation Inoperable for More Than Eleven Hours Due to Personnel Error ' 

                              .The Licensee = Event Report for this occurrence is attached, Please contact us if.you require additional information related to this event,                 a
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Thomas M Parker * 

                              . Manager Nuclear Support Services c: Regional Administrator - Region III, NRC NRR Project Manager, NRC Senior Resident ~ Inspector, NRC MPCA-Attn:  Dr J W Ferman Attachment                                                                                      <
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     "                        Both Chlorine Monitors on One Train of Control Room Ventilation Inoperable for More'Than Eleven Hours Due to Personnel Error
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LICEN8tt CONT ACT FOR TMia LER liti NAug TELEPMONE NuustM Amt A COD 4 ( Arne A Hunstad, Staff Engineer 61112 31 818l- 11 111211 COMPLETE ONS LING FOm S ACM COMPONENT f A8 LURE Ot4CAISID IN TMit REPOAT (131 R m{oomfa pagst enIt ' CJUSE Cour0NENT CAUGE S Y ST E M CouPONENT "^N( y AC- 0 SYST E M Ma% AC. l l l l l I~ l l t l l l l t ! s l l l l l l l ' l l ! } l l l MONTM OAV vtAR 

                                                               $Up*LtMENTAL mtPORT EXPECT 50 lien                                                       g,      g SutuisS8CN it t IN pen, eena.*ere LX9tCT40 Suce,Istt0N OA TEI                                  NO                                                                             l       l       l   ,g A TxACT we mo                           a . . .,...~ , a,i           M-. ev--. .- oli i                              On December 11, 1989, Unit 1 was at 83% power in coastdown for refueling, and Unit 2 was at 100% power. Due to malfunction, No. 121 Chlorine Monitor had been in BYPASS (a 7-day LCO) since December 9th. At 1900 hours on December                                                                                               ,

lith, a computer alarm indicated malfunction of No. 122 Chlorine Monitor, so l it was also placed in BYPASS (a 6-hour LCO with No. 121 Monitor out of l~ service) and its operation watched carefully. After about an hour, it was decided to put No. 122 Chlorine Monitor back in service. Telephone l' communication was established between the control room and the outplant operator at the monitor. Miscommunication caused the control room operator to I think the monitor had been returned to service when in fact it had not. At L 0615 it was discovered that No. 122 Chlorine Monitor was still in BYPASS and the monitor was returned to NORMAL. Both monitors were inoperable for over 11 hours. l l l l 1 l-ELC P.evel354 164i95

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                       .On December 11, 1989, Unit 1 was at 83% power in coastdown for refueling, and
                       ' Unit 2 was at 100% power. Due to malfur.ction, No. 121 Chlorine Monitor (EIIS
                       " Component Identifier MON) had been in BYPASS (a 7-day LCO) since December 9th.

At 1900 hours on. December 11th, a computer alarm indicated malfunction of No. ' 122-Chlorine Monitor, so it was also placed in BYPASS (a 6 hour LCO'with No. 121 Monitor out of service) and its operation watched carefully. After about i 

                       'an hour, it was occided to put No. 122 Chlorine Monitor back in service.
                       . Telephone-communication was established between the control room and the
                       -outplant operator at the monitor. Miscommunication caused the control room                                                             I operator to think the monitor had been returned to service when in fact it had                                                      !
                       -not. -At 0615 it was discovered that No. 122 Chlorine Monitor was still in                                                            i
                        -BYPASS and the monitor was returned to NORMAL,                    Both monitors were inoperable                                      ;

for over 11 hours. I i CAUSE OF THE EVENT Cause of the event was niscommunication during a telephone conversation between a control room operator and an outplant operator. Inadequate training i on.the monitoring system was a contributing cause. 

                                                                                                                                                            'l 1.
                       ' ANALYSIS OF THE EVENT-                                                                                                               i.

The. event is reportable pursuant to 10CFR50.73(a)(2)(1)(B), Both chlorine monitors on the affected ventilation train were inoperable for more than 11 hours. Their function is to monitor the air entering the ventilation ductwork leading to'the control room and to isolate the control room from that air i supply if a high concentration of chlorine is detected. The health and safety. l-of.the public were unaffected since no chlorine was present. Additionally, ll the monitoring function of No. 122 ChlorinetMonitor was still operable'. l Detection of high chlorine concentration would have alarmed, prompting the. -{ l: control room operator to initiate isolation of the control room. ll 1 I

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Prairie Island Nuc Generating Plant 1 o l5 j o lo j o l 218 l 2 819 - 012 l 1 - 0'i 0 0I3 0F 0l3 verre . w. =ac s amawnn 1 CORRECTIVE ACTION - 1 Upon discovery, No. 122 Chlorine Monitor was returned to NORMAL. Additional ll training vill be provided and will be completed by April 1, 1990. FAILED COMPONENT IDENTIFICATION I

l. MDA Scientific chlorine Detection System, Model 7040 FAN l l PREVIOUS SIMIlAR EVENTS There have been no previous similar events at Prairie Island.

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