ML102950324

Diablo Canyon - Notification of NRC Triennial Heat Exchanger Inspection 05000275-10-005 & 05000323-10-005

ML102950324
Person / Time
Site:	Diablo Canyon
Issue date:	10/21/2010
From:	Thomas Farnholtz Region 4 Engineering Branch 1
To:	Conway J T Pacific Gas & Electric Co
References
Download: ML102950324 (7)

See also: IR 05000275/2010005

Text

October 21, 2010

John T. Conway Senior Vice President-Energy &

Supply and Chief Nuclear Officer

Pacific Gas and Electric Company

Diablo Canyon Power Plant

77 Beale Street, Mail Code B32

San Francisco, CA 94105

SUBJECT: DIABLO CANYON- NOTIFICATION OF NRC TRIENNIAL HEAT EXCHANGER INSPECTION 05000275/2010005;O5000323/2010005

Dear Mr. Conway:

The purpose of this letter is to notify you that the U.S. Nuclear Regulatory Commission

(NRC) Region IV staff will conduct a triennial heat sink inspection at your facility. The inspection will be comprised of one reactor inspector from the NRC Region IV office.

The inspection will be conducted in accordance with Inspection Procedure 71111.07T, "Heat Sink Performance."

The schedule for the inspection is as follows:

Onsite inspection: December 6, 2010 - December 10, 2010

Experience has shown that this inspection is resource intensive for your staff. In order to minimize the impact to your onsite resources and to ensure a productive inspection,

we have enclosed a request for documents needed for this inspection. Please note that

the documents are requested to be provided by November 15, 2010. We request that

during the onsite inspection week, you ensure that copies of analyses, evaluations, or

documentation regarding the implementation and maintenance of your heat exchanger

program are available. Of specific interest are those documents that establish that your

heat exchanger program satisfies NRC regulatory requirements and conforms to

applicable NRC guidance. Also, appropriate personnel knowledgeable of safety-related heat exchangers should be available to support the inspector at the site during the

inspection.

We have discussed the schedule for this inspection activity with your staff and

understand that our regulatory contact for this inspection will be Michael McCoy of your

licensing organization. If there are any questions about this inspection or the material

requested, please contact the inspector, Paula Goldberg, at 817-860-8168 or by UNITED STATESNUCLEAR REGULATORY COMMISSIONREGION IV612 EAST LAMAR BLVD, SUITE 400ARLINGTON, TEXAS 76011-4125

Pacific Gas and Electric Company - 2 -

email, paula.goldberg@nrc.gov. In accordance with 10 CFR 2.390 of the NRC's "Rules

of Practice," a copy of this letter and its enclosure will be available electronically for

public inspection in the NRC Public Document Room or from the Publicly Available

Records (PARS) component of NRC's document system (ADAMS). ADAMS is accessible from the NRC Web site at http://www.nrc.gov/reading-rm/adams.html (the

Public Electronic Reading Room).

Sincerely,

/RA/

Thomas R. Farnholtz, Chief

Engineering Branch 1

Division of Reactor Safety

Docket: 50-275; 50-323

License: DPR-80; DPR-82

Enclosure: Heat Exchanger/Heat Sink

Inspection Documentation Request

cc w/enclosure: Sierra Club Santa Lucia Chapter ATTN: Andrew Christie P.O. Box 15755

San Luis Obispo, CA 93406

Jane Swanson San Luis Obispo Mothers for Peace

P.O. Box 3608 San Luis Obispo, CA 93403

James Grant, County Administrative Officer San Luis Obispo County Board of

Supervisors 1055 Monterey Street, Suite D430 San Luis Obispo, CA 93408

Truman Burns\Robert Kinosian California Public Utilities Commission 505 Van Ness Ave., Rm. 4102

San Francisco, CA 94102

Pacific Gas and Electric Company - 3 -

Jennifer Post, Esq. Pacific Gas & Electric Co. 77 Beale Street, Room 2496 Mail Code B30A

San Francisco, CA 94120

Gary Butner Chief, Radiologic Health Branch California Department of Public Health 3

P.O. Box 997414 (MS 7610) Sacramento, CA 95899-7414

The City Editor of The Tribune 3825 South Higuera Street P.O. Box 112 San Luis Obispo, CA 93406-0112

James D. Boyd, Commissioner California Energy Commission 1516 Ninth Street (MS 31) Sacramento, CA 95814

James R. Becker, Site Vice President Pacific Gas and Electric Company Diablo Canyon Nuclear Plant P.O. Box 56, Mail Station 104/6/601

Avila Beach, CA 93424

Jennifer Tang Field Representative United States Senator Barbara Boxer

1700 Montgomery Street, Suite 240 San Francisco, CA 94111

Chief, Technological Hazards Branch FEMA Region IX

1111 Broadway, Suite 1200 Oakland, CA 94607-4052

Pacific Gas and Electric Company - 4 -

Electronic distribution by RIV: Regional Administrator (Elmo.Collins@nrc.gov) Deputy Regional Administrator (Chuck.Casto@nrc.gov) DRP Director (Kriss.Kennedy@nrc.gov) DRP Deputy Director (Anton.Vegel@nrc.gov)

DRS Director (Roy.Caniano@nrc.gov) DRS Deputy Director (Troy.Pruett@nrc.gov) Senior Resident Inspector (Michael.Peck@nrc.gov) Resident Inspector (Tony.Brown@nrc.gov) Acting Branch Chief, DRP/B (Don.Allen@nrc.gov)

Senior Project Engineer, DRP/B (Rick.Deese@nrc.gov) Project Engineer, DRP/B (Greg.Tutak@nrc.gov) Project Engineer, DRP/B (Nestor.Makris@nrc.gov) Reactor Inspector, DRP/B (Christie.Denissen@nrc.gov) DC Administrative Assistant (Agnes.Chan@nrc.gov) Public Affairs Officer (Victor.Dricks@nrc.gov) Public Affairs Officer (Lara.Uselding@nrc.gov)

Project Manager (Fred.Lyon@nrc.gov) Branch Chief, DRS/TSB (Michael.Hay@nrc.gov) RITS Coordinator (Marisa.Herrera@nrc.gov) Regional Counsel (Karla.Fuller@nrc.gov) Acting Regional Counsel (David.Roth@nrc.gov)

Congressional Affairs Officer (Jenny.Weil@nrc.gov) OEMail Resource OEDO RIV Coordinator (Geoffrey.Miller@nrc.gov)

File located:_R:/Reactors/2010/DC2010005 RFI-PAG ML SUNSI Rev Compl.

X Yes No ADAMS X Yes No Reviewer Initials Publicly Avail

X Yes No Sensitive Yes X No Sens. Type Initials RIV: DRS/EB1/RI C: EB1 PGoldberg TRF for TFarnholtz

/RA/ by email

/RA/ 10/21/2010 10/21/2010 OFFICIAL RECORD COPY T=Telephone E=E-mail F=Fax

- 1 - Enclosure

Heat Exchanger/Heat Sink Inspection Documentation Request

The following heat exchangers/heat sinks have been selected for inspection:

• Component cooling water heat exchangers

• Containment fan coolers

• Ultimate heat sink

Please provide the following documentation prior to the onsite inspection week,

preferably no later than November 22, 2010 .

Test Documents

Copies of the last two heat exchanger tests for the selected heat exchangers (original test data in work orders or filled in test procedures) and copies of condition reports

associated with the heat exchanger testing

List of condition reports, with descriptions, associated with heat exchanger testing for

the past 3 years (all safety-related heat exchangers)

Copies of applicable heat exchanger test procedures for the selected heat exchangers

including test conditions and acceptance criteria

Copies of chemistry control procedures and results of chemistry sampling and a list of

condition reports concerning service water chemistry problems for the past 3 years

Documents that show the as-found results are recorded, evaluated, and appropriately dispositioned such that the as-left condition is acceptable

Cleaning Documents

Copies of the last two heat exchanger cleaning results for the selected heat

exchangers, original data (found in filled test procedures or work orders) and condition reports associated with heat exchanger cleaning

Cleaning procedures with acceptance criteria for the selected heat exchangers

List of condition reports, with descriptions, associated with heat exchanger cleaning for

the past 3 years (all safety-related heat exchangers)

Show that as-found results are recorded, evaluated, and appropriately dispositioned

such that the as-left condition is acceptable

- 2 - Enclosure

Design Documents

Copies of vendor data sheets and design basis data for the selected heat exchangers

The design margin of the heat exchangers (the maximum heat transfer rate achievable

at design basis conditions compared to the vendor's design heat transfer rate)

Copies of calculations which show the heat exchangers will meet their design basis requirements under worst case conditions. Calculation for the maximum allowable

number of tubes plugged and how many tubes are currently plugged

For room coolers, calculations of the maximum room temperature under accident

conditions and determination that the coolers can maintain less than the maximum

temperature under design conditions

Documents that show that the heat exchangers have been evaluated for potential water

hammer

Instrument uncertainties of the instruments used during testing

Corrective action reports concerning cavitation noise in any heat exchanger system

The most recent audit report of heat exchanger testing and cleaning

The most recent service water flow balance test results, both as-found and as-left

Documents for the Ultimate Heat Sink

Testing documents or other equivalent methods that verify the performance of the

ultimate heat sink and its components

Calculations which shows there is sufficient water capacity for the required 30-day

supply

Procedure or work order that show there is monitoring and trending of sediment build-up

Procedure for periodic performance monitoring of heat transfer capability

Procedures for the periodic performance of the ultimate heat sink structural integrity

Document that verifies adequate chemistry monitoring to ensure adequate pH, calcium,

etc. are maintained

Documents that explains the operation of the ultimate heat sink

- 3 - Enclosure A description of the clean up system between the water supply and the ultimate heat

sink

If elements of the ultimate heat sink can freeze during cold weather, documentation or

calculations to show that there will still be sufficient water to meet design conditions under the worst case freeze conditions

A description of the sump pump that circulates the water in the ultimate heat sink during

freeze conditions, and documentation which show that the sump pump and valves are

safety-related

Calculations of the maximum allowable amount of silt that can be in the ultimate heat

sink, and any condition reports written in the past three years about problems with silt

List of condition reports, with descriptions, of problems with the ultimate heat sink for the

past three years

Corrective Action Documents

List of corrective action documents, with descriptions, for the past 3 years for all

safety-related heat exchangers

Inspector Contact Information:

Paula Goldberg

Reactor Inspector

817-860-8168

paula.goldberg@nrc.gov

Mailing Address:

US NRC Region IV

Attn: Paula Goldberg

612 East Lamar Blvd., Suite 400

Arlington, TX 76011-4125