IR 05000237/1993002
| ML17179A765 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 03/02/1993 |
| From: | Jablonski F, Schrum D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML17179A764 | List: |
| References | |
| 50-237-93-02, 50-237-93-2, 50-249-93-02, 50-249-93-2, NUDOCS 9303090412 | |
| Download: ML17179A765 (7) | |
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U. S. NUCLEAR REGULATORY COMMISSION
________ REGION_ III
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Reports No:
50-237/93002(DRS); No. 50-249/93002(DRS)
Docket Nos:
50-237; 50-249 Licenses No:
Commonwealth Edison Company Executive Towers West III 1400 Opus Place-Suite 300 Downers Grove, IL 60515 Facility Name:
Dresden Nuclear Power Station Units 2 and 3 Inspection At:
Morris, Illinois Inspection Conducted:
January 11-15 and February 18-22, 1993 Inspector:
3-2-Cf 3 Date Approved By: 1-*
/l..'
s-2- rrs ablonski, Chief Date nance and Outages Section Inspection summary Inspection on Januarv 11-15 and Februarv 18-22, 1993 CReoorts N /93002CDRSl, No. 50-249/93002CDRSll Areas Inspected: Routine fire protection inspection of surveillances, equipment, fire brigade training and drills, zebra mussel problems, and fire protection audit The inspector utilized selected portions of NRC inspection procedures 64704 and 9270 Results: Steady improvements continued in the fire protection progra Overall, the fire protection program was considered goo The staff was knowledgeable and had taken appropriate actions to correct issues and problem Strengths included correcting hardware deficiencies, performing surveillances, and training of fire brigade member Fire doors and transient combustibles were well controlle Critiques of fire brigade drills were performed wel Control of fire protection concerns was adequate in the area of plant modification Reliability and material condition of the diesel driven fire pumps was poo Preventive maintenance was being increased and the pump/engines were being considered for replacemen Concerns were identified with the reliability of the Unit 1 loop fire main and the overuse of repetitive checklists during audit **
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DETAILS Persons Contacted Commonwealth Edison Company (CECo)
- R. Black, Assistant Fire Marshal E. Carroll, Regulatory Assurance
- L. Cartwright, Assistant Technical Staff Supervisor
- A. D'Antonio, Supervisor Quality Verification
- M. Dillion, Fire Marshal
- R. Flahive, Technical Superintendent
- B. Gurley, Regulatory Assurance
- K. Housh, Technical Staff Fire System Engineer
- J. Kotowski, Operations Manager
- D. Mershon, Technical Staff Fire Protection Engineer M. Nagle, Fire Brigade Instructor
- D. Roberts, Corporate Fire Protection Engineer R. Stachniak, Operating Engineer D. Winchester, Internal Audit Group Superintendent u. s. Nuclear Regulatory Commission CNRC)
M. Leach, Senior Resident Inspector M. Peck, Resident Inspector
- Denotes those individuals attending the exit meeting on February 22, 199 Routine Fire Protection Program Review (64704)
This inspection consisted of observations of plant areas and reviews of fire protection surveillances, maintenance on fire protection equipment, fire brigade training and drills,- fire reports, deviation reports, work requests, safety evaluations, controls to prevent bio-fouling by zebra mussels, and audits of fire protection activitie.1 Observation of Plant Areas The inspector observed several areas of the reactor building and turbine buildin The observation included hose stations, extinguishers, sprinkler valves, emergency lights, and housekeepin The inspector determined that the equipment was being maintained in good condition. Housekeeping was excellent prior to the outage, although housekeeping could have been improved during outage activitie For example, rags were left in work areas and large quantities of anti-contamination clothing were allowed to accumulat The majority of the wood used during outage activities was treated to make it fire resistan Fire resistant plastic was also being use Lubricants and oils were properly stored in fire resistant cabinets or in steel
container Equipment areas were mostly free of oil as the result of equipment leak Appropriate controls for cutting and
_____ w_e_],~Jn_g __ Qp~rat_ions
__ w_ere _being _enforced-.- -No-d-iscrepane-ies -were- - -
noted with sprinklers or with fire main valves or header Halon bottles were at appropriate pressures and fire extinguishers had been inspected and had a current inspection dat No areas were noted where sprinklers should have been installed but were not already in plac Controls were being maintained for transient combustibles and fire door All fire doors were functional and temporary outage cables had been routed to ensure that the fire doors were operabl.2 Surveillances The inspector reviewed completed surveillance procedures for 199 The surveillances were performed accurately and on time..
The observations and discrepancies were corrected with the exception of the Unit 2/3 diesel fire pum Numerous engine and pump problems were noted in surveillances DFPP 4123-5, "Unit 2/3 Diesel Fire Pump Weekly Operability."
The licensee was making efforts to better utilize surveillance resources based on risk and failure rate of equipment, which helped make resources available for other effort.3 Maintenance on Fire Protection Equipment 2~ Diesel Fire Pumps The diesel fire pumps (DFP) were poorly maintaine Very little preventive maintenance (PM) was don Maintenance history showed that the DFPs had a large number of failures during the 1990 to 1993 time perio The repair data indicated that the DFPs went from failure to failure without any overall corrective actions to correct the situatio The failures were caused by years of neglect when PM efforts were not appropriate for the importance of the DFPs, that is, for fire protection and refilling the condenser following a station blackou PM activities did not include replacing parts that deteriorated with age, such as hoses and gaskets, and checking strainer For example, when one of the DFP engine coolant hoses burst because of age and pressure, the licensee did not replace the other hose The hoses were also not put on a PM schedule to be replace Other failures included gaskets, radiator caps, packing, and seal The engine coolant strainer was not on the PM schedule for periodic cleanin Strainers were only cleaned in the fire main system following a proble Other system strainers had been cleaned and checked for the first time since their installation more than 20 years ag DFPl engine failed in 199 The licensee could not pinpoint the exact cause, but the engine had overheated several times in the six m~~~l:i~-
.P~_3=_9r __ t_o ___ this_.pr_oblem.. -- -The---eng~ne- *Wa-s--rep-l-aced-*but--- - -------- ------
--~---- -- ------the-Pump is in poor condition with very little margin to meet its
flow requiremen Maintenance history indicated that the reliability of DFP 1 increased after the engine replacemen The pump and engine are scheduled for replacement in 199 A modification package was approved and the licensee is pursuing an equipment supplie Repair data indicated that DFP 2/3 was in poor conditio The reliability was lo The failure rate was high and occurred even though the pump was only operated 40-50 hours per yea As a result of an engine hose failure, DFP 2/3 failed the same time DFPl faile The licensee was able to make repairs within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> otherwise the reactors were required to be shut dow The licensee purchased a third DFP that can be temporarily connected until one of the two main pumps are repaire The problem of shutting down the plants is solved, but the reliability has not been increased much for the two main fire pumps in the event of a fir Both DFPs will be replaced in the 1993/1994 time frame. In addition, improved PM procedures are in the concurrence cycle for the existing pump Also, The PM schedule now includes checking and cleaning strainer The technical superintendent stated during the exit that the DFPs would be put on the Technical Issues List, which assures that adequate resources will be devoted for improving the material condition of the DFP. Batteries Surveillance reports indicated that maintenance of the DFP batteries had been a problem including water levels, possible overcharging, and maintaining specific gravit The licensee had taken action to turn over the maintenance of the batteries to the electrical group during 199 Following this change the surveillance reports indicated that the condition of the batteries had improve. Unit 1 Yard Fire Main Loop The Unit 1 yard fire main loop appeared to be in poor conditio The 1992 fire protection insurance log indicated that the fire loop was inoperable several times in 1991 and 199 The problems were believed to have occurred because of being disturbed during the installation of the sewage system, and not as a result of the asbestos cement piping being made brittle because of pressure
cycling and agin Maintaining reliability of the loop is important because both main fire loops are required to meet the
... ~-~q:µJ!:e111ents_Q!.lQ __ CFR 5_0, _.Appendix R.-- -Cur:r-ent--low*- rel-ia*bi;li ty- -
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makes it questionable whether this system will be available during a fir.4 Fire Brigade, Fire Reports, and Fire Drills Fire brigade members received extensive training, which included classroom and offsite fire fightin The onsite fire drill requirements had been met by all brigade members who were listed as qualifie All appropriate drill and training records were properly maintaine A review of the fire records indicated that the fire brigade was only required to respond twice in 199 The two events were for a motor fire and a power transformer fir The small number of responses was indicative of good control of combustibles, cutting/welding activities, and housekeepin Recent efforts at improvements for fire fighting include purchasing more equipment to better outfit the fire brigade members, with plans to locate the equipment at strategic locations in the plan This will allow a faster response to fire.5 Deviation Reports and Work Requests Review The inspector reviewed open nuclear work requests (NWRs) for fire protectio The backlog was low considering the high number of NWRs that had been performed during the yea The NWRs had been properly prioritized and none of the outstanding work items appeared to be highly safety significan The backlog had been reduced from 175 to 139 during 199 In addition, the fire protection Nuclear Tracking system (NTS) backlog had been reduced from 65 to 32 in 199 There have been numerous tamper switch maintenance problems on fire protection valve Many of the problems resulted from old tamper switches and the difficulty in purchasing replacement part A contributing factor was that the switches were an add-on feature, which was easily knocked out of calibratio These problems were being corrected by including valves on the locked valve program with valves being maintained in position by chains and lock Specific locks and keys will be maintained for fire protection valve The licensee reviewed the valves to assure that those important to safety were included in this effor Some valves had been added to or deleted from the list based on the revie..
- I CFR 50.59 Safety Evaluations
_________ Th.e_ma_jority_ of __ the_ fire--protection -pi::og-ram-has-been- -removed-- from----------=-
the Technical Specificatio This allows changes to be made to the fire protection program by performing a 10 CFR 50.59 safety evaluatio The inspector reviewed 10 CFR 50.59 safety evaluations issued for program changes for 199 All of the changes were appropriate and were not detrimental to fire protection safet Some surveillance cycles had been extended based on industry data and failure rate The safety evaluations that delayed performing full flow testing of the fire main system for six months were based on preventing zebra mussels from entering the fire protection systems, and to give the licensee adequate time to make corrective action The plant is currently dealing with a bio-fouling problem, zebra mussel infestation, in its intake wate Zebra mussels were found last summer on screens in the intake structur Notable efforts were being made to prevent zebra mussels from entering the fire main systems and potentially making the fire protection systems inoperabl Full flow surveillances of the fire protection system were susp.ended for six months to permit modifications to the system Hypochlorite is being injected into the service water system, which connects to the keep fill line of the main syste In addition, thermal shock treatment is also being used to kill the mussel A modification is planned for an injection system into the fire main syste Strainer checks indicate that the zebra mussels have not entered the fire main syste The licensee has increased the surveillance frequency for strainer The concentration of chemicals will be monitored in the fire main system following the full flow tests to ensure that the system is maintained zebra mussel fre.7 Audits of Fire Protection Activities The inspector reviewed the following audits of fire protection activities:
Quality Assurance/Nuclear Safety Audit Report Number 12-91-I, January 17 through 30, 1991; Quality Assurance/Nuclear Safety Audit Report Number 12-92-I, January 27 through 31, 1992; and Offsite Quality Verification Audit Report Number 12-93-I, December 14 through 18, 199 Preparation for the audits was goo The audit reports were brief and did not indicate the amount of reviews that had been performed in the fire protection are The audits had adequate detail to detect most program problem The licensee had taken timely corrective actions for those fire protection deficiencies that were identified during the audit The audits met regulatory requirement \\
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In general, the audits were more compliance based rather than being performance base The licensee utilized a repetitive check_ li~t. ~PPJ::O~Ch. to_ auditing.. _ The.-check-lists i-nd-icated tohat-
- activities listed had been reviewed in detail; however, this continued approach could contribute to missing deficiencies year after yea For example, problems with the DFP and Unit 1 yard loop reliability, which are discussed in Paragraph 2.3, were not discussed in the audit.
Exit Interview The inspector met with licensee representatives (denoted in Paragraph 1) on February 22, 1993, and summarized the scope and findings of the inspection. The informational content of the inspection report was discussed with regard to documents reviewed during the inspectio The licensee did not identify any of the documents as proprietar