ML20033H056
| ML20033H056 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/11/1990 |
| From: | Wallace E TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9004180025 | |
| Download: ML20033H056 (8) | |
Text
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 SN 1578 Lookout Place APR 111990 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) - MEDIAN SIGNAL SELECTOR (MSS) TESTING NRC' requested that TVA provide additional information on the periodic testing to be performed'on the MSS feature to support their review of Technical Specification Change 89-27.
Excerpts from draft. functional test'and' calibration procedures are provided in Enclosures 1 and 2, respectively.
The steam generator level-channel functional-test procedures will.be revised to-ensure that the MSS module is functionally tested on a quarterly basis.
The feedwater control system calibration procedures will be revised to ensure that calibration of the MSS module is performed on a refueling outage frequency.
Summary statements of commitments contained in this submittal are provided in.
Please direct questions concerning this issue to Russell R. Thompson at (615) 843-7470.
Very truly yours, TENNESSEE VALLEY AUTHORiiY 1
E. G. Ha< lace, Manager Nuclear Licensing and Regulatory Affairs Enclosures cc: See page 2 hp 9004NffC D
k FDB P
An Equal Opportunity Employer J
- U.S. Nuclear Regulatory Commission APR 111990-cc (Enclosures):
Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. H11 son, Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Sequoyah Nuclear Plant 2600 1900 Ferry Road Soddy Daisy, Tennessee 37379
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e ENCLOSURE 1 DRAFT MEDIAN SIGNAL SELECTOR (MSS)
FUNCTIONAL TEST
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a SQN FUNCTIONAL TEST OF STEAM GENERATOR l-SI-IFT-003-107.1 LEVEL CHANNEL III RACK 11 Rev. 0 1
Page 16 of 29 6.4 As Found Data Verification
[1]
REVIEW printout AND VERIFY the following:
A. Comparator Output LB-548A as follows:
SETPOINT - 75 %
RESET POINT = 74 %
[
MIN MAX TECH SPEC MIN MAX ACTUAL ACTUAL ALLOWABLE ACTUAL ACTUAL 1 74.8 1 75.2 1 76.0 1 73.8 1 74.2 D-B. Trip Actuation Test - Set and Reset passed.
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[2]
VERIFY by reviewing chart on Recorder 1-FR-3-103'tFR-540) that the Blue pen (Median Signal Selector output) DID NOT follow the Automatic Surveillance Test signal during testing.
/
[3]
IF the Trip Actuation Test failed OR the Median Signal Selector output followed the Auto signal THEN NOTIFY the SIMF for PRO evaluation AND E
PROCEED as directed. (N/A signoff if notification not necessary.)
/
NOTE Steps 6.4[4] through 6.4[6] below give actions based on "As Found" data printed. Only one of these options can apply.
[4]
IF the Comparator Set and Reset values are within tolerance AND, the Trip Actuation Test Set and Reset passed, THEN PROCEED TO Section 7.0, POST PERFORMANCE ACTIVITIES.
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ENCLOSURE 2 1
DRAFT MEDIAN SIGNAL SELECTOR'(MSS)
CALIBRATION r
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e 6.7 Feedwater. Median Signal Selector (MSS) 2 111AX (1LY-547D)
Module' Calibration
[1] PERFORM the following to calibrate the Median Selector' Module.
[a] LIFT the following wires
-Performed Verified' By by A. Input A Terminal Number ( ?
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B. Input B Terminal Number ( ?
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C. Input C Terminal Number ( ?'
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[b] CONNECT Voltage sources to the following points:
A. Input A Terminal Number ( ? )
D B. Input B Terminal Number ( ? )-
D C. Input C Terminal Number ( ? )
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[c] APPLY 0.0 vde to input B.
[d] APPLY 6.0 vde to input C.
[e] APPLY 1.000 vde to input A AND.
l ADJUST R-16 (zero pot) for 1.000 vde at output.
[f] APPLY 5.000 vde to input A AND ADJUST R-19 (span pot) for 5.000 vde at output.
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[2] REPEAT [e] and [f] above until desired outputs i
+/- 0.004 vde are obtained.
[3] RECORD the output values for inputs o'f 1.000 and 5.000 Vdc L
in "As Left" section of Data Sheet.
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[4] ADJUST input B to 3.000 vde AND
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RECORD output value in "As Left" Section of Data Sheet.
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-F;;dwater Medicn Signal S21ccter'(MSS) IN-3-111AX (1LY-547D)
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[5] PFJtFORM the following to, verify Median Signal. Selector is working properly..
(a) APPLY 2.000 Vdc to input A.
(b] APPLY 4.000 Vdc to input.C.
(c) VARY input B slowly.beginning at 1.000 Vdc and continuing to 5.000 Vdc while observing the output.
'l If the operation of MSS is correct the output will be.at 2.000 Vdc until the input exceeds 2.000 Vdc then i
The output will follow the input until it reaches
-4.000 Vdc and remain at this value as the input is l
increased to 5.000 Vdc.
[6] VERIFY.that all Data recorded is within:the required Accuracy as listed on Data Sheets and the MSS functioned properly as described in step ic] above.-
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4 ft ENCLOSURE 3 List of Cormnitments a
1.
The' steam generator level-channel functional-test procedures will be-revised to ensure that the MSS module is functionally tested on a 1
quarterly basis.
2.
The feedwater control system calibration procedures will be revised to ensure that calibration.of the MSS module is performed on a refueling outage frequency.-
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