ML20099G100

Notification of NRC Triennial Heat Sink Performance Inspection (05000528/2020002, 05000529/2020002, and 05000530/2020002) and Request for Information

ML20099G100
Person / Time
Site:	Palo Verde
Issue date:	04/08/2020
From:	Vincent Gaddy Division of Reactor Safety IV
To:	Lacal M Arizona Public Service Co
References
IR 2020002
Download: ML20099G100 (8)

See also: IR 05000528/2020002

Text

April 8, 2020

Mrs. Maria L. Lacal

Executive Vice President/

Chief Nuclear Officer

Arizona Public Service Company

P.O. Box 52034, MS 7602

Phoenix, AZ 85072-2034

SUBJECT: PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 -

NOTIFICATION OF NRC TRIENNIAL HEAT SINK PERFORMANCE

INSPECTION (05000528/2020002, 05000529/2020002, AND

05000530/2020002) AND REQUEST FOR INFORMATION

Dear Mrs. Lacal:

On June 15, 2020, the Nuclear Regulatory Commission (NRC) will begin the onsite portion of

the Triennial Heat Sink Performance Inspection at your Palo Verde Nuclear Generating Station

Units 1, 2, and 3. This inspection will be performed in accordance with NRC baseline inspection

procedure (IP) 71111.07 by two inspectors from the NRCs Region IV office for one week.

In order to minimize the impact that the inspection has on the site and to ensure a productive

inspection, we have enclosed a request for documents needed for the inspection. The

documents have been divided into three groups.

• The first group lists information necessary for our initial inspection scoping activities.

This information should be available to the lead inspector no later than May 4, 2020.

By May 7, 2020, the inspector will communicate the initial selected set of approximately

two to three risk-significant heat exchangers.

• The second group of documents requested includes those items needed to support our

in-office preparation activities. This set of documents, including the calculations

associated with the selected heat exchangers, should be available no later May 26,

2020. This information should be separated for each selected component, especially if

provided electronically (e.g., folder with component name that includes calculations,

condition reports, maintenance history, etc.). During the in-office preparation activities,

the inspectors may identify additional information needed to support the inspection.

• The last group includes the additional information above as well as plant specific

reference material. This information should be available onsite to the inspectors on

June 15, 2020. It is also requested that corrective action documents and/or questions

developed during the inspection be provided to the inspector as the documents are

generated.

M. Lacal 2

It is important that these documents be as complete as possible in order to minimize the number

of documents requested during the preparation week or during the onsite inspection.

All requested documents are to be for the time period from the onsite inspection period back to

the last Triennial Heat Sink Performance Inspection. If nothing addressing a request was done

in that time period, then the request applies to the last applicable document in the previous time

period.

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

our regulatory contact for this inspection will be Mr. D. Mohamed of your licensing organization.

If there are any questions about this inspection or the material requested, please contact the

lead inspector, Wayne Sifre, by telephone at 817-200-1193 or by e-mail at

Wayne.Sifre@nrc.gov.

PAPERWORK REDUCTION ACT STATEMENT

This letter contains mandatory information collections that are subject to the Paperwork

Reduction Act of 1995 (44 U.S.C. 3501 et seq.). The Office of Management and Budget (OMB)

approved these information collections (approval number 3150-0011). Send comments

regarding this information collection to the Information Services Branch, Office of the Chief

Information Officer, Mail Stop: T6 A10M, U.S. Nuclear Regulatory Commission, Washington,

DC 20555-0001, or by e-mail to Infocollects.Resource@nrc.gov, and to the Desk Officer, Office

of Information and Regulatory Affairs, NEOB-10202, (3150-0011) Office of Management and

Budget, Washington, DC 20503.

PUBLIC PROTECTION NOTIFICATION

The NRC may not conduct nor sponsor, and a person is not required to respond to, a request

for information or an information collection requirement unless the requesting document

displays a currently valid OMB control number.

In accordance with 10 CFR 2.390 of the NRCs 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,

M. Lacal 3

Agencywide Documents Access and Management 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,

Vincent G. Gaddy /RA/

Vincent Gaddy, Chief

Engineering Branch 1

Division of Reactor Safety

Docket Nos. 50-528, 50-529, and 50-530

License Nos. NPF-41, NPF-51, and NPF-74

Enclosure:

Triennial Heat Sink Performance Inspection

Request for Information

cc w/ encl: Distribution via LISTSERV

ML20099G100

SUNSI Review ADAMS: Non-Publicly Available Non-Sensitive Keyword:

By: VGaddy Yes No Publicly Available Sensitive NRC-002

OFFICE SRI/EBI C:EB1

NAME WSifre VGaddy

SIGNATURE /RA/ /RA/

DATE 04/08/2020 04/08/2020

Request for Information

Triennial Heat Sink Performance Inspection

Palo Verde Nuclear Generating Station Units 1, 2, and 3

Inspection Report: 05000528/2020002, 05000529/2020002, and 05000530/2020002

Inspection Dates: June 15-20, 2020

Inspection Procedure: IP 71111.07, Triennial Heat Sink Performance

Inspectors: Wayne C. Sifre, Senior Reactor Inspector

Fabian D. Thomas, Reactor Inspector

I. Information Requested by May 4, 2020:

1. List of the Generic Letter (GL) 89-13, Service Water System Problems Affecting Safety-

Related Equipment, heat exchangers in order of risk significance.

2. Copy of heat exchanger performance trending data tracked for each GL 89-13 heat

exchanger.

3. List of corrective action program documents (with a short description) associated with

GL 89-13 heat exchangers, heat sinks, silting, corrosion, fouling, or heat exchanger

testing, for the previous two years or since the last heat sink performance inspection.

4. Copy of any self-assessment done on any of GL 89-13 heat exchangers done since last

heat sink performance inspection.

5. System health report(s) and maintenance rule system notebooks for all the GL 89-13

heat exchangers.

6. Copy of your responses for GL 89-13.

II. Information Requested by May 26, 2020:

1. For the specific heat exchangers selected:

a. Copies of the two most recent completed tests confirming thermal performance for

those heat exchangers which are performance tested;

b. Copy of system description and design basis document for the heat exchangers (as

applicable);

c. Copy of any operability determinations or other documentation of degradation

associated with the heat exchangers or the systems that support the operation for

the selected heat exchangers;

d. Copy of the Updated Final Safety Analysis Report (UFSAR) sections applicable for

each heat exchanger; and

Enclosure

e. Provide a list of calculations with a description which currently apply to each heat

exchanger.

2. A schedule of all inspections, cleanings, maintenance, or testing of any plant heat

exchanger to be done during the onsite portion of the inspection.

3. Copies of procedures developed to implement the recommendations of GL 89-13,

(e.g., the GL 89-13 Heat Exchanger Program description).

4. Pages from the UFSAR for the GL 89-13 Heat Exchanger Program.

5. Maximum GL 89-13 heat exchanger inlet temperatures that still allow full licensed power

operation of the nuclear reactor. Please provide the documents that state these limits

(e.g., UFSAR or Technical Requirements Manual (TRM)) and the operating procedures

that ensure these limits are not exceeded.

III. Information Requested by June 15, 2020

1. For the specific heat exchangers selected:

a. Provide the Design Basis Documents and Updated Final Safety Analysis Report

pages for the selected heat exchangers;

b. Copy of the design specification and heat exchanger data sheets for each heat

exchanger;

c. Copy of the vendor manuals including component drawings for each heat exchanger;

d. Copy of the calculation which establishes the limiting (maximum) design basis heat

load which is required to be removed by each of these heat exchangers;

e. Copy of the calculation which correlates surveillance testing results from these heat

exchangers with design basis heat removal capability (e.g., basis for surveillance test

acceptance criteria);

f. Copy of the calculations or documents which evaluate the potential for water

hammer or excessive tube vibration in the heat exchanger or associated piping;

g. List of engineering-related Operator Workarounds/Temporary Modifications for these

heat exchangers since the last Heat Sink Performance Inspection;

h. Copy of the evaluations of data for the two most recent completed tests confirming

the thermal performance of each heat exchanger;

i. Documentation and procedures that identify the types, accuracy, and location of any

special instrumentation used for the two most recently completed thermal

performance tests for the heat exchangers (e.g., high accuracy ultrasonic flow

instruments or temperature instruments). Include calibration records for the

instruments used during these tests;

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j. Copies of those documents that describe the methods taken to control water

chemistry in the heat exchangers;

k. Copies of the documents that verify the structural integrity of the heat exchanger,

e.g., eddy current summary sheets, ultrasonic testing results, and visual inspection

results;

l. The cleaning and inspection maintenance schedule for each heat exchanger for the

next 5 years;

m. Copy of the document describing the inspection results for the last two cleaning and

inspection activities completed on each heat exchanger;

n. Copy of the document which identifies the current number of tubes in service for

each heat exchanger and the supporting calculation which establishes the maximum

number of tubes which can be plugged in each heat exchanger;

o. Copy of the document establishing the repair criteria (plugging limit) for degraded

tubes which are identified in each heat exchanger; and

p. Information regarding any alarms which monitor on-line performance.

2. For the ultimate heat sink (UHS):

a. Maintenance or inspection of inaccessible below-water portions of the UHS system

including results of underwater diving inspections and assessments of sediment

intrusion and/or removal of sediment; and

b. Documentation of inspections to verify no structural damage to intake structures that

would indicate loss of structural integrity and/or capacity.

3. For the safety-related Residual Heat Removal service water and Diesel Generator

Cooling Water systems:

a. Copies of the pipe testing and/or inspection program procedures and the latest

completed surveillances and tests verifying structural integrity of the piping;

b. History during the last three years of any through wall pipe leak on the system and

the disposition documentation; and

c. Copies of the procedures to monitor, assess, and disposition active through wall pipe

leaks, including structural evaluations and/or planned corrective actions.

If the information requested above will not be available, please contact Wayne Sifre as soon as

possible.

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Inspector Contact Information:

Wayne C. Sifre Fabian D. Thomas

Senior Reactor Inspector Reactor Inspector

817-200-1193 817-200-1126

Wayne.Sifre@nrc.gov Fabian.Thomas@nrc.gov

Mailing Address:

U.S. NRC, Region IV

Attn: Wayne Sifre

1600 East Lamar Blvd.

Arlington, TX 76011-4511

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