2CAN078401, Forwards Revised Schedule for Installation of Inadequate Core Cooling (ICC) Monitoring Sys,Test Program Status & Plans for ICC Instrument Installation During Next Refueling Outage.Review Process Will Be Discussed at 840712 Meeting

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Forwards Revised Schedule for Installation of Inadequate Core Cooling (ICC) Monitoring Sys,Test Program Status & Plans for ICC Instrument Installation During Next Refueling Outage.Review Process Will Be Discussed at 840712 Meeting
ML20093A168
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 07/05/1984
From: John Marshall
ARKANSAS POWER & LIGHT CO.
To: John Miller
Office of Nuclear Reactor Regulation
References
2CAN078401, 2CAN78401, NUDOCS 8407100169
Download: ML20093A168 (15)
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ARKANSAS POWER & LIGHT COMPANY POST OFFICE box 551 LITTLE ROCK. ARKANSAS 72203 (501) 371-4000 July 5, 1984 2CAN078401 Director of Nuclear Reactor Regulation ATTN: Mr. James R. Miller, Chief Operating Reactors Branch #3 Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555

SUBJECT:

Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 Impact of AN0-2 2.R4 Outage Schedule on ICC Instrumentation Program Gentlemen:

As a supplement to our letter dated June 4, 1984 (2CAN068402), we are providing, as attachments to this letter, the following information:

A.

Our revised (best estimate) schedule for installation of the ANO-2 ICC monitoring system; B.

Our test program status; and C.

Our plans for accomplishing ICC instrument installation during 2R4.

Attachment A provides the key completion dates (Milestones) for our current installation schedule.

Due to the complexity of the schedule, detailed entries are not included on Attachment A however, they will be available at our July 12, 1984, meeting.

As indicated in previous correspondence, installation during the next ANO-2 refueling outage will be difficult due to the earlier than expected outage.

In an attempt to expedite the project, authorization has now been given to procure materials and begin fabrication of the instrument probes.

This authorization was given based on the satisfactory indication from preliminary test results.

It should be noted that the original schedule did 8407100169 840705 0\\

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4 Mr. James R. Miller July 5, 1984 not call for authorization of fabrication until af ter NRC acceptance of the ICC systems.

Our authorization of fabrication before NRC approval should not be construed as e bypass of NRC's review, rather as an expediting means and a reflection of our confidence in the system.

- If we are to be successful with installation at the next refueling, it is imperative that we work very closely with the NRC during the review and approval of this system. As the schedule is very short, we believe an interactive review process is the best means to this end.

We will be providing information as soon as it is available for NRC review in an attempt to expedite the review process.

We wish to discuss the review process in greater detail during our upcoming meeting on July 12.

Very truly yours, t

R. Marshall Manager, Licensing JRM/JM/ac Attachment i

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ATTACHMENT A Schedule For ANO-2 ICC Hardware Installation The schedule to develop and test our proposed system to monitor inadequate core cooling (ICC) for ANO-2 has been carried out to date essentiay as originally planned.

The results of this first phase are discussed in Attachment B.

This attachment discusses our concern for the need to begin interaction with the NRC in order to accomplish ICC hardware installation during 2R4. As stated in our letter dated June 4, 1984, (2CAN068402), we are currently anticipating that the fourth refueling outage will begin February 2,1985.

Three figures are included as milestone charts of our current schedule (A-1), an original schedule (A-2), and both schedules combined (A-3).

The milestones for the schedule we are now following are depicted in Figure A-1.

There are several critical dates on this figure we wish to bring to your. attention.

Two bars appear in Zone 1 of this figure as " NRC Review &

Approve ICC System" and "NRC Approve Detailed Design Specification (DDS)."

The end date of the system review directly impacts our planned start date for fabrication of the in-vessel RGTs.

The end date of the DDS review directly impacts our planned date for authorizing the in plant construction activities necessary to install the ICC system hardware.

We believe that the stated interactions with the NRC in the preceding paragraph are essential to the success of the ICC project as currently planned. Many activities, which would normally await the approval of a proposed system by the NRC (see Fig. A-2), are being pursued on the anticipation of approval.

However, the RGTs, which are the key components of the in-vessel instrumentation (denoted RLI), depend upon the date of NRC approval as an acceptable means of sensing level under ICC conditions.

Should approval of our proposed system not be achieved in time to support the schedule, or should we be required to use some alternate sensor, then there would be insufficient time to accomplish the installation during 2R4.

As shown on Figure A-1, the schedule for the final report on the proposed system'is to submit our report to you on July 27, 1984 with review assumed to be completed, and approval granted, by September 24, 1984.

The impact on the authorization for construction is similar in that there is significant in-vessel, in-containment, and control room work which must be planned and scheduled to accomplish hardware installation during 2R4.

This is complicated further since the system design bases call for a safety grade and siesmically qualified installation.

The information in the DDS is needed to plan for this modification, and must await approval by the NRC as a part of our commitments stated in our ietter of December 13, 1983 (2CAN118303).

Changes to the DDS will necessitate a change to any plans developed.

As the advancement of the outage schedule has already imposed a great hardship on work scheduled for the outage, a delay in receipt of an approved DDS will cause the work schedule for ICC to slip from its current start date. This does not account for additional time lost by delays in

material receipt or any event which may cause an early start of the outage, both being possible, or for unanticipated difficulty experienced during installation. Therefore, the schedule for construction planning and installation is extremely sensitive to your response to our efforts.

If approval of _ the DDS can be achieved earlier, then the possibility of accomplishing ICC hardware installation will be correspondingly improved.

To put the schedule in perspective we have included as Figure A-3 a combined chart of the milestones for the current and original schedules based upon the 2R4 outage. As depicted, the original schedule (shown also on Figure

'A-2) is based on our current knowledge of the project requirements and t

assuming the start of 2R4 had remained September 15, 1985.

The original schedule had a reserve time (float) of approximately 90 days. The dramatic shift in the key dates from the original to the current schedule illustrates that all float was lost when the outage start advanced beyond June 26, 1985.

Since then we have had to compress the schedule such that our current schedule is a compromise of many aspects of the project.

This was necessary to create an expedient plan to prepare hardware and achieve the installation of the ICC instrumentation during 2R4.

This effort is being made', although the anticipated outage-has moved up significantly, in the spirit of our commitment as stated in our letter of April 15, 1983, (2CAN048306), to meet the 2R4 schedule.

The milestones depicted in Zone 1 of the figures include target dates for

-the ten commitments specified in our letter of December 13, 1983.

We must emphasize that these dates as they pertain to the ICC hardware are our current schedule to achieve installation during 2R4 with an anticipated outage start date of February 2, 1985; and that the dates for milestones 7

beyond hardware installation are merely based on working values and do not change the commitments previously made.

The details of the project were not available when the letter of December 13, 1983, was prepared. We believe that a complete review of our current planning would be useful to the NRC's understanding of the urgency of the schedule.

We are making every effort to 5

accomplish our current schedule and achieve completion of the milestones up to and including turning on the system for operator familiarization.

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face-to-face meeting would allow us to explain the details on which we base the current schedule and to discuss the completion of all milestones.

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ATTACHMENT B Inadequate Core Cooling Confirmatory Test Program Status The confirmatory test program consisted of a series of tests to provide a basis for justification that the Radcal Gamma Thermometer (RGT) will adequately perform as an ICC Monitor.

Three sets of test series were performed.

These tests consisted of the following:

(1) Air-Water Test Series, (2) Upper Head Test Series, and (3) In-Core Test Series. A brief discussion of each of the test series follows.

Air Water Test Series The overall objectives of tMis test series were:

To provide basic design data on the manometer tube stilling column and RGT assembly's performance.

To demonstrate that the final prototype manometer tubes and probes are capable of making level measurements in a variety of air-water mixtures and flows.

To obtain basic performance data, response time, and fill and drain rates of the manometer tube probe assemblies, and To determine the boundary conditions of flow and void fraction under which the probe assembly can provide unambiguous data to a reactor operator.

Upper Head Test Series The overall objectives of this test series were:

Demonstrate that the prototype gamma thermometers can supply measurements to provide effective ICC monitoring of the upper head and upper plenum of the reactor, Provide data to determine the boundary conditions on unambiguous gamma thermometer ICC monitoring performance -

depressurization rates (break size), flow rates (pumps-off sensitivity), and refill repressurization; j)

Confirm that the absolute temperature measurement provides a good indication of coolant temperature > above the core in an ICC event; and Provide data to select the optimum sensor types and arrangements in the gamma thermometer probe for ANO-1 and ANO-2.

r In-Core Test Series The overall objectives of this series were:

Demonstrate that the prototype gamma thermometers can supoly measurements to provide effective ICC monitoring in the reactor core; Provide data to determine the boundary conditions on unambiguous gamma thermometer ICC monitoring performance -

depr ssurization rates (break size), flow rates (pumps-off sensitivity), and refill repressurization; Confirm that the absolute temperature measurement provides a good indication of coolant temperature in the core in an ICC event, and obtain data on how closely the RGT reflects fuel thermal performance; Obtain data to help confirm that the gamma thermometer can monitor effectiveness of natural circulation cooling; and Provide data to select the optimum sensor types and arrangements in the gamma thermometer probe for ANO-1 and ANO-2.

All of the confirmatory testing has been completed.

The tests results are presently undergoing analysis.

The final report covering all three test sets is currently scheduled to be submitted to NRC in late July.

A preliminary summary of test results for the Air-Water Test Series and the Upper Head Test Series is provided below.

The In-Core Test Series has just been completed; hence, test results are not available as of this date.

Air-Water Preliminary Summary of Test Results The following overall conclusions can be reached regarding the air / water testing of the RGT-manometer assembly:

1.

Manometer separation efficiency is approximately a linearly decreasing function of void fraction.

2.

There is a strong correlation between bottom slot row vertical spacing and manometer separation efficiency.

Greater spacing shows decreasing efficiency.

3.

All considerations lead to a bottom manometer port pattern of one row of 3 slots on 120 centerline spacing, 0.031 in, high, and 0.327 in, wide.

The top manometer port pattern is 3 vertical slots on 120 centerline spacing,1.0 in. high, and 0.125 in. wide.

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4.

The RGT sensors have time constants in air from 3.7 min to 5.2 min and in water from 16.6s to 33.0s.

These results are consistent with those obtained in the TEC calibration loop.

5.

The ratio of the steady-state outputs in air to those in water for the RGT sensors varies from 1.25 to 12.5.

6.

The RGT-manometer system for the variety of sensors tested does not show an output change with void fraction in the range 6% to 32% in the test section.

7.

The manometer tube drain time is 6 seconds.

8.

The RGT is not sensitive to two phase flow with void fractions from 6% to 82% and, therefore, will not be a reliable indicator of liquid inventory when the reactor coolant pumps are running, as was expected.

9.

The manometer tube clearing time is not a dominant parameter in uncovery response time.

10.

The RGT-manometer tube assembly shows an offset from the "real" collapsed liquid level 0-20 in for all void fractions of interest, filling or draining.

11.

All data taken show the RGT-manometer tube assembly can be used as an indicator of liquid inventory for void fractions typical of upper-head small-break LOCA conditions, 0% to 40%,

all drain rates between 0.55 and 4.57 ft/ min, and all fill rates between 0.125 and 9.23 in./sec.

Upper Head Preliminary Summary of Test Results The breadth of the parameter space in the Upper Head Test Series was significant.

Variations in blowdown rate, reflood rate, initial temperature, and initial flow were included. 'Further three sensor types and three gas gap length variations within two of the sensor types were tested.

The overall conclusions from this test series are:

1.

All RGT rods maintained their mechanical integrity, operability, and performance throughout the test series.

2.

All RGT sensor types respond well to blowdown and reflood transients and could be utilized as ICC warning devices with relatively simple type-specific data processing.

3.

Inventory loss or gain rate can be determined in addition to inventory.

4.

There is no practical difference in response of RGT rods containing different numbers of sensor locations (12-and 16-cable pack designs).

r 5.

The response of the sensors is predictable, including l

variations in absolute temperature and flow.

The comparison of the performance of sensor types is presented in Table B-1 by category.

Best in a category is 1 and worst is 3.

The comparison of the performance of gas gap length by category is l

presented in Table B-2.

The categories are ordered in importance from the most important at the top to the least important at the bottom of 4

the tables.

Based on this ranking, the fast-type sensor is the best overall ICC monitor, and the 0.75-inch gas gap length is the best overall length.

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Table B-1 PERFORMANCE OF SENSOR TYPES DURING UPPER HEAD TEST SERIES (1 = Best, 2 = Middle, 3 = Worst)

Signature Category Slow Fast of Uncovery Tracking Collapsed Liquid Level 2

1 3

Splashing Sensitivity 1

2 3

Signal Doubling Time 2

1 3

Uncovery (Blowdown) Signal / Initial Signal 2

1 3

Recovery (Reflood) Signal / Initial Signal 2

3 1

Magnitude of Initial Signal 1

3 2

Accuracy as a Rate Monitor 2

1 3

Absolute Temperature Sensitivity 3

1 2

Flow Sensitivity 1

3 2

TOTAL 16 16 22 e

Table B 2 PERFORMANCE OF GAS-GAP LENGTHS DURING UPPER HEAD TEST SERIES (1 = Best, 2 = Middle, 3 = Worst)

Length (inches)

Category 0.75 1.00 1.25 Tracking Collapsed Liquid Level 1

2 3

Splashing Sensitivity 3

2 1

Signal Doubling Time 1

2 3

Uncovery (Blowdown) Signal / Initial Signal 1

2 3

Recovery (Reflood) Signal / Initial Signal 3

2 1

Magnitude of Initial Signal 3

2 1

Accuracy as a Rate Monitor 1

2 3

Absolute Temperature Sensitivity 1

2 3

Flow Sensitivity 3

1:

1 TOTAL 17 ly 19

ATTACHMENT C Outline of Current Plan for ANO-2 ICC Monitoring Hardware Installation The following table is an abbreviated summary of activities as currently scheduled for installing the ANO-2 ICC monitoring system during 2R4.

The format is such that the activities performed by AP&L, NRC, or by vendors are grouped by associated time-frames, and so appear in roughly chronological order. The end points of major activities (milestones) are depicted on Figure A-1 of Attachment A.

AP&L VENDORS NRC Submit Fn1 Des Spec; Tubg Spec; Mdi-1 Intrfc & Htr Cb1 Dwgs; Incmg Test Prcd for TC, Tubg, & Htr Cb1; Procure Material for RLI and Prototype; Prepare Estimate, Sched, Prepare RLI Calib Prcd &

& W0s; Issue Proj Auth Cold Calib Loop; Quick-Lk Rpt Issue Task Auth Sys B1k Diag & RLI Intrfc Dwg; Prepare Fni Test Rpt; Qualify Connectors; Begin K2 Calculations Review Prelim Dwgs & Sys Fact Accept Test Pred; Start B1k Diag; Prepare Fnl RLI Assembly Dwgs Sys Rpt for NRC; Prepare Schematics &

P&ID C'v1 & Cab Loc /Mtg; Cet &

Bracket Des; Hardwr Ot1 Start review of Rcwy Conn; Pon1 Lyt Dwgs; Spec; Des Elec Conn; ICC system Softwr Des Rev; Procure DAS Hrdwr; Issue RFPs for Pntrs &

Code Software; RLI Prcs Complete Sys Rev &

Sp1 Kits; Rev Bracket Des; Spec; Test /Insp Proto &

Approve ICC Sys Begin Cv1 Cndt Sup, Mech RLI Matis; Assemble DAS; Des, & I&C Summary Fni DDS Reev Pntr & Sp1 Kit Bids; Submit DDS; Fab & Calib Complete Cv1 & Mech Des; Proto; Standoff Spec &

Finalize & Rev DCP, Rev Fab; Begin In-Vessel Guide Tube Cutting; RLI Fab; Transmit K2 Prepare NRC-DOS Results; Prep Cold Calib Submittal; Issue DCP Loop

r AP&L VENDORS NRC Pit Approve DCP Unit Test Softwr; Install Fab Pnte Fdthrg &

Stndoffs/Proto; DAS Sp1 Kits; Rev DDS Complete; Begin DAS Tes't Submittal; Issue J0; Final. Des & Doc Softwr; Softwr Integration; RGT Fab Complete; Bracket Reev DDS Submittal Onsite; Plt Est & Schdl; Sys Integration Test -

Approve WO; Onsite Complete; Install Elec Approve DDS Equip Complete, Trans & Conn; Prepare Authorize Constr; Qualificetion Rpt Begin Non-Outage Trnsmt QLal Rpt; Install; Eng F1d Install Standoffs; Fact Supt; Accept Test & Crate Sys; Ship RLIs Begin Outage DCP Fact Accept /Snpg Install; Test complete DCP; Funct Test &

Calib; Rev DCP &

Issue As-Builts; System Turned On

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