ML20212J627
| ML20212J627 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 01/13/1987 |
| From: | Blumer D, Mcnutt G, Russell J TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20212J485 | List: |
| References | |
| 229.12(B), 229.12(B)-R03, 229.12(B)-R3, NUDOCS 8701280254 | |
| Download: ML20212J627 (4) | |
Text
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TVA EMPLOYEE CONCERNS REPORT NUMBER: 229.12(B)
SPECIAL PROGRAM REPORT TYPE:
SEQUOYAH ELEMENT REVISION NUMBER:
3 NON-RESTART JUSTIFICATION
SUMMARY
TITLE:
INSTRUMENTATION AND CONTROL DESIGN Panel To Equipment Distances PAGE 1 0F 2 REASON FOR REVISION:
1.
Incorporation of coments by P. B. Nesbitt (TVA), 11/11/86 2.
Incorporation of coments by P. B. Nesbitt (TVA), 12/08/86 3.
Incorporation of coments by P. B. Nesbitt (TVA), 12/19/86 PREPARATION PREPARED BY:
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' DATE CONCURRENCES A0 lb dP6 8701280254 870120 T
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SIGNATURE DATE SIGNATURE
- DATE APPROVED BY:
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ECSP MANAGER DATE MANAGER OF NUCLEAR POWER DATE CONCURRENCE (FINAL REPORT ONLY) in files.
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- SRP Secretary's signature denotes SRP concurrences are
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SEQUOYAH NUCLEAR PLANT b
ENGINEERING RELATED ENPLOYEE C0hCERNS SPECIAL PROGRAM NON-RESTART JUSTIFICATION
SUMMARY
SUBCATEGORY / ELEMENT 229.12(B)
This concern was raised on WBN and is considered generic to SQN due to the basic similarity of the two plants and the general nature of the concern.
The concerned individual refers to " instrument panels" which control equipment. Except for some localized testing, most equipment in a nuclear power plant is controlled by electrical signals from the main control room.
Indication of key process variables in the main control room makes physical observation of the equipment unnecessary. Rigorous human factors engineering reviews, and compliance with FSAR Section 7.5 ensure the main control room l
operators have sufficient information at their convenient disposal to control the plant without seeing the individual equipment itself.
The concern could be interpreted to mean, the " instrument panels are located too far from the associated egoipment and process sensors." This presents an entirely different issue and requires the use of words that are not in the concern. Response time may be a concern here. The distance of electrical or ge electronic controls from the equipment is not critical for response time.
Properly installed instrument sensing lines avoid the inclusion of compressible fluids which increase response time. Such instrumentation contains only subcooled, virtually incompressible liquids resulting in response tines orders of magnitude shorter than the time required for most processes to change. Where response time is critical (e.g., reactor protection and engineered safety feature parameters) it was tested and deficiencies corrected per NRC's Regulatory Guide 1.22.
Since successful operation of SQN has been accomplished any further deficiencies with regard to
" instrument panel" to equipment distance should have been detected and corrected.
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There are no TVA design criteria, NRC regulatory guides or industry standards i
(e.g., ISA) limiting the distance of controls from equipment. No NRC IE Notice or Bulletin deals with this issue and no adverse operating experience L
is reported in Nuclear Plant Operating Experience Inc. reports due to remote controls, per se.
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ATTACHMENT: List of Issues for Mechanical ELEMENT NO.
229.12(B) i Date:
12/12/86 l
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-o' L151 0F MECHANICAL ISSUES SQN.RESTARI _
ELEMENT Nt!!8ER 229.12 BY:
W. M. Blumer Date: 12/12/B6 LLLMLN1 WHERE RESPON-CONCERN NUMBER (S)
ISSUES ADDR(SSED stb _LE,
GE_NERAL,APfR0ACH/ML1H0_00 LOGY FOR LLEMENI REPORT 1%-85-068-N06 1.
Panel to Equipment distances are WM8 ~
1.
Clarify terminology of the concern.
NRC identified the following too large.
2.
Investigate possible disadvantages of remote concern from review of Q1C controls and the mitigating features.
file.
"A lot of instrument panels are located far away 3.
Survey NRC regulatory guides, IVA design from the equipment they control."
criteria, and industry standards for distance limitations of controls f rom equipment.
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e REFERENCE
- ECPS120J-ECPS121C TENNESSEE VALLEY AUTHORITY PAGE 120 FREQUENCY
- REQUEST OFFICE OF NUCLEAR POWER RUN TIME - 12:57:19 ONP - ISSS - RHM EMPLOYEE CONCERN PROGRAM SYSTEM (ECPS)
RUN DATE - 12/02/86 LIST OF EMPLOYEE CONCERN INFORMATION CATEGORY: EN DES PROCESS & OUTPUT SUBCATEGORY: 22912 PANEL / INSTRUMENT DISTANCE
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S GENERIC KEYHORD A H
APPL QTC/NSRS P
KEYHORD B CONCERN SUB R PLT BBSH INVESTIGATION S
CONCERN KEYNORD C HUMBER CAT CAT D LOC FLQB REPORT R
DESCRIPTION KEYHORD D g
IN 068-N06 EN 22912 N HBN YYYY SR NRC IDENTIFIED THE FOLLONING CONCERN REPORT FROM REVIEH OF QTC FILE.
"A LOT OF INSTRUMENT PANELS ARE LOCATED FAR A
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HAY FROM THE EQUIPMENT THEY CONTROL.
1 CONCERNS FOR CATEGORY EN SUBCATEGORY 22912 g
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