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. t AE0D TECHNICAL' REVIEW REPORT UNIT: | |||
LICENSEE: | Catawba Nuclear Station, Units 1, 2 DOCKET NOS.: | ||
50-413, 50-414 TR REPORT NO.: AEOD/T907 DATE: | |||
April 26, 1989 LICENSEE: | |||
Duke Power Company EVALUATOR / CONTACT: | |||
L. Padovan NSSS/AE: | |||
Westinghouse / Utility | |||
==SUBJECT:== | ==SUBJECT:== | ||
| Line 26: | Line 31: | ||
==SUMMARY== | ==SUMMARY== | ||
( | ( | ||
E | E On February 5,1988, Duke Pcwer Company determined that T-drains on 22 Unit 2 | ||
/ | / | ||
Limitorque valve actuators at Catawba had been painted over, or were missing. | |||
A similar inspection of Unit 1 Limitorque valve actuators also revealed that 20 actuators had missing or paint clogged T-drains. | A similar inspection of Unit 1 Limitorque valve actuators also revealed that 20 actuators had missing or paint clogged T-drains. | ||
The identified actuators were environmentally qualified for service in harsh environments which can exist following a loss of coolant accident, a main steam line break, or other high energy line breaks. Functioning T-drains were required to maintain these actuator environmental qualifications. Some of the affected actuators were located on valves which function to mitigate the effects of postulated accidents. These valves included containment isolation valves, reactor head vent valves, inlet valves for the Unit I hydrogen "skirrrner fan", and other valves located in the auxiliary buildings. | The identified actuators were environmentally qualified for service in harsh environments which can exist following a loss of coolant accident, a main steam line break, or other high energy line breaks. Functioning T-drains were required to maintain these actuator environmental qualifications. Some of the affected actuators were located on valves which function to mitigate the effects of postulated accidents. These valves included containment isolation valves, reactor head vent valves, inlet valves for the Unit I hydrogen "skirrrner fan", and other valves located in the auxiliary buildings. | ||
As a result of-the identified concerns, AEOD initiated this study to investi- | As a result of-the identified concerns, AEOD initiated this study to investi- | ||
. gate the generic applicability of component degradation due to indiscriminate painting. The study evaluated 65 Licensee Event Reports (LERs) which were identified.through a LER text search on the word " paint",. utilizing the NRC's NUDOCS system. None of the 65 LERs evaluated were found to involve component degradation from indiscriminate painting. Accordingly, no generic safety significance was cetermined to be associated with this issue, and no further AE0D actior; in this regard is warranted. | |||
DISCUSSION | DISCUSSION | ||
( | ( | ||
1. | |||
Description of Catawba Occurrences l | |||
On February 5,1988, in response to concerns identified by an NRC environ-mental qualification (EQ) team inspection, a review of Unit 2 Limitorque I | |||
valve actuator T-drains was performed by the utility. The review revealed that T-drains had been painted over, or were missing, on 22 Unit 2 Limitorque valve actuators. An inspection of Limitorque actuators on Unit I valves also revealed that 20 actuators had missing or paint clogged T-drains. The affected actuators were Limitorque Models SB, SMB, and SBD, which were utilized in the containment buildings and steam doghouses. | |||
Some of the affected actuators were located on valves which function to mitigate the effects of postulated accidents. These valves included containment isolation valves, reactor head vent valves, inlet valves for the Unit I hydrogen "skimirer fan," and other valves located in the auxi-liary buildings. | Some of the affected actuators were located on valves which function to mitigate the effects of postulated accidents. These valves included containment isolation valves, reactor head vent valves, inlet valves for the Unit I hydrogen "skimirer fan," and other valves located in the auxi-liary buildings. | ||
h | h DO S | ||
____a | |||
: c. a | : c. a | ||
-2 4 | |||
ks the Limitorque actuator motors were not completely sealed from the environment, T-drains were installed in the motor compartments to drain condensate which would be formed from trapped steam under accident conditions. | |||
Undesired accumulation of condensate could saturate the motor insulation and short circuit the motor. T-drains also provided actuator internal to external pressure equalization. Hence, T-drains were required-to maintain actuator environmental qualifications. | |||
As corrective action, all missing and paint clogged T-drains were repaired or replaced. Applicable painting and maintenance procedures were revised, and a program for periodic training of painters was established. | As corrective action, all missing and paint clogged T-drains were repaired or replaced. Applicable painting and maintenance procedures were revised, and a program for periodic training of painters was established. | ||
2. | |||
Operational Data This study was performed utilizing a LER text search on the word " paint". | |||
65 LERs were identified which contained the word'" paint", but none in-volved degradation of critical components from indiscriminate painting. | 65 LERs were identified which contained the word'" paint", but none in-volved degradation of critical components from indiscriminate painting. | ||
Typical subjects of the identified LERs were as follows: | Typical subjects of the identified LERs were as follows: | ||
- Automatic initiation of emergency air filtration systems. | |||
- Painting of components, | |||
- Burned, discolored, or blistered paint due to excessive temperatures, | |||
- Inadvertent actuation or damage to equipment from painting activities in the same area, | |||
- Torque paint on bolts, Hissed surveillance due to wet paint, 6 | |||
- Scraping of paint due to movement, and | |||
- Paint chips in undesired locations. | |||
FINDINGS AND CONCLUSIONS None of the.65 LERs, which were identified from a text search on the word | FINDINGS AND CONCLUSIONS None of the.65 LERs, which were identified from a text search on the word | ||
" paint" utilizing the NUDOCS system, were fcund to involve component degrada-tion from indiscriminate painting. Accordingly, no generic safety significance was determined to be associated with this issue, and no further AE0D action in this regard is warranted at this time. | |||
) | |||
_}} | |||
Latest revision as of 02:26, 2 December 2024
| ML20245F940 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 04/26/1989 |
| From: | Padovan L NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | |
| Shared Package | |
| ML20245F931 | List: |
| References | |
| AEOD-T907, NUDOCS 8905030040 | |
| Download: ML20245F940 (2) | |
Text
_ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ - _ _ _ - _ _ -
..v
. t AE0D TECHNICAL' REVIEW REPORT UNIT:
Catawba Nuclear Station, Units 1, 2 DOCKET NOS.:
50-413, 50-414 TR REPORT NO.: AEOD/T907 DATE:
April 26, 1989 LICENSEE:
Duke Power Company EVALUATOR / CONTACT:
L. Padovan NSSS/AE:
Westinghouse / Utility
SUBJECT:
COMPONENT DEGRADATION DUE TO INDISCRIMINATE PAINTING
SUMMARY
(
E On February 5,1988, Duke Pcwer Company determined that T-drains on 22 Unit 2
/
Limitorque valve actuators at Catawba had been painted over, or were missing.
A similar inspection of Unit 1 Limitorque valve actuators also revealed that 20 actuators had missing or paint clogged T-drains.
The identified actuators were environmentally qualified for service in harsh environments which can exist following a loss of coolant accident, a main steam line break, or other high energy line breaks. Functioning T-drains were required to maintain these actuator environmental qualifications. Some of the affected actuators were located on valves which function to mitigate the effects of postulated accidents. These valves included containment isolation valves, reactor head vent valves, inlet valves for the Unit I hydrogen "skirrrner fan", and other valves located in the auxiliary buildings.
As a result of-the identified concerns, AEOD initiated this study to investi-
. gate the generic applicability of component degradation due to indiscriminate painting. The study evaluated 65 Licensee Event Reports (LERs) which were identified.through a LER text search on the word " paint",. utilizing the NRC's NUDOCS system. None of the 65 LERs evaluated were found to involve component degradation from indiscriminate painting. Accordingly, no generic safety significance was cetermined to be associated with this issue, and no further AE0D actior; in this regard is warranted.
DISCUSSION
(
1.
Description of Catawba Occurrences l
On February 5,1988, in response to concerns identified by an NRC environ-mental qualification (EQ) team inspection, a review of Unit 2 Limitorque I
valve actuator T-drains was performed by the utility. The review revealed that T-drains had been painted over, or were missing, on 22 Unit 2 Limitorque valve actuators. An inspection of Limitorque actuators on Unit I valves also revealed that 20 actuators had missing or paint clogged T-drains. The affected actuators were Limitorque Models SB, SMB, and SBD, which were utilized in the containment buildings and steam doghouses.
Some of the affected actuators were located on valves which function to mitigate the effects of postulated accidents. These valves included containment isolation valves, reactor head vent valves, inlet valves for the Unit I hydrogen "skimirer fan," and other valves located in the auxi-liary buildings.
h DO S
____a
- c. a
-2 4
ks the Limitorque actuator motors were not completely sealed from the environment, T-drains were installed in the motor compartments to drain condensate which would be formed from trapped steam under accident conditions.
Undesired accumulation of condensate could saturate the motor insulation and short circuit the motor. T-drains also provided actuator internal to external pressure equalization. Hence, T-drains were required-to maintain actuator environmental qualifications.
As corrective action, all missing and paint clogged T-drains were repaired or replaced. Applicable painting and maintenance procedures were revised, and a program for periodic training of painters was established.
2.
Operational Data This study was performed utilizing a LER text search on the word " paint".
65 LERs were identified which contained the word'" paint", but none in-volved degradation of critical components from indiscriminate painting.
Typical subjects of the identified LERs were as follows:
- Automatic initiation of emergency air filtration systems.
- Painting of components,
- Burned, discolored, or blistered paint due to excessive temperatures,
- Inadvertent actuation or damage to equipment from painting activities in the same area,
- Torque paint on bolts, Hissed surveillance due to wet paint, 6
- Scraping of paint due to movement, and
- Paint chips in undesired locations.
FINDINGS AND CONCLUSIONS None of the.65 LERs, which were identified from a text search on the word
" paint" utilizing the NUDOCS system, were fcund to involve component degrada-tion from indiscriminate painting. Accordingly, no generic safety significance was determined to be associated with this issue, and no further AE0D action in this regard is warranted at this time.
)
_