IR 05000245/1985008

Insp Repts 50-245/85-08 & 50-336/85-12 on 850326-29.No Violation Noted.Major Areas Inspected:Maint Activities Re Preservation of Civil Structures & Structural Supports from Deterioration

ML20127N006
Person / Time
Site:	Millstone
Issue date:	06/20/1985
From:	Durr J, Varela A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
Shared Package
ML20127M996	List: IR 05000245/1985008 ML20127M992
References
50-245-85-08, 50-245-85-8, 50-336-85-12, NUDOCS 8507010407
Download: ML20127N006 (6)

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U.S. NUCLEAR REGULATORY COMMISSION

REGION I

50-245/85-08 Report N /85-12 Docket No and 50-336

' License Nos. DpR-21 and DPR-65 Priority --

Category C Licensee: Northeast Nuclear Energy Company post Office Box 270 Hartford, Connecticut 06101 Facility Nane: Millstone Nuclear Power Station Unit I and Unit 2 Inspection .\t: Waterford, Connecticut Inspection Conducted: March 26-29, 1985 Inspector: . l b k A. At Var'ela, Lead Reactor Engineer bdate

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Approved by: /. dAh'u ering Branch, DRS 20 8I

'datd 7 Durr, C{ {, Enginf InspectionSummaM: InspectiononMar2h26-29,1985(ReportNos. 50-245/85-08 and 50-336/85-12)

Areas Inspected: Routine, unannounced inspection by one region based inspector of maintenance activities related to preservation of civil structures and structural supports from deterioration, The inspection involved 32 inspector-hours at the plant and 4 inspector-hours of in-office revie (27 for Unit 1; 9 for Unit 2).

Results: No violations were identifie PDR ADOCK 05000245 G PDR f

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DETAILS Persons Contacted Northeast Utilities Company (NUSCO)

G. Closius QA Supervisor F. Dacimo Maintenance Supervisor, Unit 2 J. Ferriell Assistant Maintenance Supervisor

• R. Herbert Station Service Superintendent

• E. Laine Radiation Protection Supervisor, Unit 2 J. Leason Engineering /ISI

• E.J. Mroczka Station Superintendent

• R. Peterson Assistant Maintenance Supervisor, Unit 1 J. Quinn Senior Engineer, Unit 1

• W. Romberg Station Superintendent, Unit 1 J.F. Smith Engineering Supervisor, Unit 2 J. Stansbury Maintenance Planner, Unit 2

• J. Summa Senior Engineer, Unit 1

• W. Varney Maintenance Supervisor, Unit 1 N,RC

• J.T. Shediosky Senior Resident Inspector 2. Maintenance cf Civil Structures 2.1 Scope of Inspection This inspection effort primarily to review the licensee's program and requirements for maintenance of plant structures. Civil structures and their supports and components which deteriorate during plant operation, exposure to seasonal atmospheric changes, continuous emersion in salt water, marine life attack and age were reviewed. The inspection concentrated on Unit 1 for reason of its age. A walkdown inspection of Unit 1 maintenance activities inside the plant as well as outside was performed. The Unit 1 plant's exterior maintenance requirements and reports were reviewed and discussed with maintenance, engineering, quality control and quality assurance personnel. A significant advance in maintenance management is identified in effect for Unit 2. It is an overall computerized process and approach to the planning, management and control of maintenance activitie .2 Walkdown Inspection - Unit 1 Exterior Structures

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A walkdown inspection was performed of exterior civil structures. Their supports and components were reviewed to assess required maintenance as identified in licensee procedure Intake Structure and Screen House

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rotary screens - 18 month replacement after sandblast and paint

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cathodic protection for underwater pumps, screens, etc - monthly electrical check of a node tube and screens cleaned of debris six times a year

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sprocket and drive chain paint all units every month and grease bearings Service Water Pump House - replace one of four GE pumps and one emergency pump every-18 months Emergency and Reserve Offsite Power Towers - salt build-up on insulators is monitored by " Japanese" instrument using demineralized water for need of steam cleaning Demineralized and Condensate Storage Tanks - inspected by diver in 1980, found no internal deterioration of aluminum Condensate Storage Tank, Radwaste Storage Tanks and Concrete Moats - these are checked for possible radioactive leakage after each rain storm Liquid Nitrogen Tanks - heat-trace insulation on pipe requires annual maintenance to prevent freezing and, verification of tanks electrical heat controls Fire, Water and Domestic Water Storage Tanks - have been inspected by a diver to check internal paint adequacy to prevent corrosion and pitting of carbon steel; diver report of October 18, 1984 for both tanks resulted in sandblast and painting of one tank Main Transformer - requires protection from bird excrement, uses bird scare devices Acid and Caustic Tanks and Pumps - require visual check and anti-corrosion paint as needed for protection of concrete from drip and leakage House Heating Boiler Stack - clean out and inspection of ash pit at base indicates acid ccerosion of structural steel supports. This was reported under project assignment te Berlin NUSCO engineering with comment to verify condition and report on repair if its replacement is necessary Gas Turbine Building - air intake on flat concrete stone roof with stone cover was inspected for evidence of deterioration and functionality of

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roof drains; roof requires 18 month maintenance to prevent loose gravel ingestion by the air intake Correspondence of March 14, 1985 by the licensee to NRR identifies NNECO intention to develop and implement a formal inspection program for

. Millstone #1, Inservice Inspection of Water Control Structures. More detailed inspection and maintenance information is contained in this letter which references NUREG-0824 of February 1983 for the Unit 1 Systematic Evaluation Progra .3 Walkdown Inspection - Unit 1 Maintenance of Interior Structures An information gathering walkdown inspection was performed of selected inside plant equipment, structures and components to review with licensee's assistant maintenance supervisor the extent and frequency of plant maintenance, to assess preventative and corrective maintenance and to be apprised of maintenance in support of ASME section eleven, inservice inspection. The walkdown review also included samples of accessible equipment / components identified in licensee's revised inservice pump and valve test program and procedures sent to NRR January 16, 1985, " Revised Inservice Pump and Valve Test Program".

Areas reviewed and licensee activities included:

Turbine Building

condensate booster pumps: monthly vibration check to compare chart records for trends a

reactor feed water pumps: monthly ISI vibration check; original concrete supports replaced 1971

• heat exchanger / closed cooling water: outside contract maintenance involving retubing (identified by eddy current check); performed once since initial installation Reactor Containment a

motor control panels: maintenance of air conditioning units for environmental qualification (EEQ)

• hydraulic accumulator: maintenance of solenoid valves

low pressure coolant injection and core spray pumps: ISI surveillance assisted by maintenance personnel

LPCI vertical heat exchangers: eddy current test every refueling outage

fuel pool cleanup: maintenance every 5 to 6 years in conjuction with GE to reduce fuel pool accumulation

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control rod drive: maintenance of packing to prevent leakage a

• heat exchanger /RCCW: maintenance to prevent valve leakage i

• reactor recirculation pump.s: maintenance every refueling involves oil replacement and analysis of oil i

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• , reactor water clean-up pump room: install remote electrical pick-up J for ISI in high radiation area-

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control r d rebuild room: every refueling outage paint circulating water screens

iso-condenger tank: hydrostatic test and inspection every refueling outage directed by engineering and snubber maintenance at same frequerzy (steam condensing ir, tanks causes water hammer, requires

' check,of cable restraints-braces, floor supports)

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• refueling floor: maintenance between and during refueling operation

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' involves servicing and operation of lifting devices, auxiliary

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equipment and organization of space for storage

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• emergancy diesel generator: inspected every 500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> and at each refueling; weekly one hour run requires visual inspection The Unit #1 hourly maintenance personnel _ presently employed consist of

seven electricians and 30 mechanics. Their productive time charged to

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,q maintenance

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,t is estimated to be distributed as follows:

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r$dwaste 20%

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h6ating and ventilation 15

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service water systems 10

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miscellaneous / security fences and support to-other departments 10

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. preventive maintenance.and ISI 45 support

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Additionally, contract forces and interplant maintenance force personnel provide maintenance service ,

2.4' Unit 2 - Production Maintenance Management System (PMMS)

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' The licensee has instituted the PMMS computer - based system at Millston , jThe ins'pector was informed that Unit 2 has had the system in place for at

,,c, least one year. The major objectives of PMMS are to minimize the cost of maintenance, ensure plant availability and reliability, to maintain ,

e responsiveness to the regulatory and reliability reporting system i commitments, and improve overall mainteaance work efficiencies. This is

,, accomplished by " Data Base Management" whici uses on-line interactive computer technology. A standard numbering / identification system for uniquely,1dentifying items and assemblies in Unit 2 has been

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completed. The automated system, the inspector was informed, includes readily retrievable maintenance information for approximately thirteen thousand four hundred items and includes plant operating equipment and component .5 Review of Licensee Quality Assurance Unit 1 Maintenance Activities The licensee's onsite quality assurance personnel were interviewed and records pertaining to their inspection of maintenance activities were reviewed. Other licensee site audit personnel and their reports were sampled for compliance to station procedures. The licensee's corporate office audits of the Unit 1 1984 outage activities were included in the inspector's review. The inspector observed that: inspections and audits used check lists; requirements and findings were clearly defined and documented; corrective actions were verified; and, technical issues involving procedural changes were satisfactorily resolve . Exit Interview The inspector met with licensee representatives (denoted in paragraph 1)

at the conclusion of the inspection on March 29, 1985 at the Millstone Point Plant. The inspector summarized the scope and findings of the inspection. The licensee acknowledged the inspector's comments. At no time during this inspection was written material provided to the licensee by the inspector.