ML20073D383
| ML20073D383 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 04/07/1983 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8304130461 | |
| Download: ML20073D383 (3) | |
Text
__
6 e
TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II April 7, 1983 c.)
w
\\
o BLRD-50-438/81-45
- o zI'O BLRD-50-439/81-47 I
. :U p
d
~
m, U.S. Nuclear Regulatory Conunission
}
Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - DRESSER SAFETY VALVES -
BLRD-50-438/81-45, BLRD-50-439/81 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector D. Quick on July 9, 1981 in accordance with 10 CFR 50.55(e) as NCR BLN NEB 8109 This was followed by our interim reports dated August 7, 1981 and February 17, and October 14, 1982. Enclosed is our final report. TVA does not now consider the subject nonconforming condition adverse to the safe operation of the plant. Therefore, we will amend our records to delete the subject nonconformance as a 10 CFR 50.55(e) item.
If you have an. questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.-
Very truly yours, TENNESSEE VALLEY AUTHORITY.
.vlD#
L. M. Mills, Manager Nuclear Licensing Enclosure oc: Mr. Richard C. DeYoung, Director (Enclosure)
Office of ' Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 cc: Continued on page 2 OFFICIAL COPY, r304130461 830407
[0~,1-PDR ADDCK 05000438 i
S PDR An Equal Opportunity Employer
. U.S. Nuclear Regulatory Commission April 7, 1983 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 i
Mr. R. J. Ansell, Manager, (Enclosure)
Bellefonte Project Services Babcock & Wilcox Company P.O. Box 1260 Lynchburg, Virginia 24505
[
r ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 DRESSER SAFETY VALVES NCR BLN NEB 8109 BLRD-50-438/81-45, BLRD-50-439/81-47 10 CFR'50.55(e) i FINAL REPORT f
i Description of Deficiency 4
A Dresser safety valve, model 31709NA, tested in Electric Power Research i
Institute's (EPRI's) safety and relief valve test program apparently suffered unacceptable internal damage during a full pressure steam test.
The configuration of piping associated with this valve is similar, but not identical, to that intended for use at Bellefonte; and at this time it is 4
uncertain if the piping configuration or the valve is deficient. The Dresser valves are to be used at Bellefonte as pressurizer safety valves.
i The valve was tested June 3, 1981 with the valve set to open at 2480 psia.
The valve opened at 15 psi below this set point, chattered severely, and subsequently failed to close properly. Post test inspection of the valve i
indicated internal damage to components including galling of guide surfaces.
i Safety Implications I
In the Bellefonte design, the safety valve is bolted directly to the l
pressurizer vessel nozzle. When the Dresser safety valve model 31709NA was tested in a configuration more similar to the Bellefonte configuration i
(i.e., short inlet piping), the valve achieved stable flow for all full pressure steam tests. No chattering or unstable valve performance was
~
demonstrated.
(See Section 3.2 of EPRI/CE Safety Valve Test Report, Volume 4 of 10, Test Results for Dresser Safety Valve Model 31709NA.)
Therefore, it is concluded that the Dresser safety valves in the Bellefonte 1
design configuration will not chatter or be unacceptably damaged under _ full j
pressure steam flow conditions. Therefore, there are no safety implica-l tions to Bellefonte, and TVA no longer considers this item to be reportable under 10 CFR 50 55(e). In addition, this item no longer has any Part 21 j
implications for TVA plants.
I i
l l
. 1 t
i
--r 5
w-w p-iiy v
g-w
---y w-,
g-y---
9 9