ML20081A590
| ML20081A590 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 10/19/1983 |
| From: | Erhardt R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20081A593 | List: |
| References | |
| 25506, MFC-23-83, NUDOCS 8310260331 | |
| Download: ML20081A590 (7) | |
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Consumets Power Company General offices: 1945 West Parnall Road, Jackson, MI 49201 + (517) 788-0550 October 19, 1983 MFC 23-83 Harold R Denton, Director Office of Nuclear Reactor Regulation Division of Licensing US Nuclear Regulatory Commission Washington, DC 20555 MIDLAND ENERGY CENTER PROJECT MIDLAND DOCKET NOS 50-329, 50-330 SYSTEMS INTERACTIONS FILE 0921.1.7 SERIAL 25506
REFERENCE:
J W COOK TO H R DENTON DATED JUNE 7, 1983, SERIAL 22457 ENCLOSURES: ATTACHMENT A (1) PROCEDURE FOR PERFORMING CALCULATIONS AND TECHNICAL STUDIES (2) PROCEDURE FOR RESOLUTION OF SSIP/S POSTULATED INTERACTIONS (3) PROCEDURE /OR PREPARATION OF PROJECT TECHNICAL REPORTS ATTACHMENT B (1) A COMPARISON OF DESIGN AND CONSTRUCTION PROCESSES FOR SAFETY-GRADE AND NON-SAFETY GRADE STRUCTURES, SYSTEMS AND COMPONENTS This letter forwards supplemental information on the seismic portion of the Midland Systems Interaction Program. The three procedures in Attachment A in conjunction with the information previously submitted in the referenced letter constitute the seismic portion of the Midland Systems Interaction Program.
Attachment B provides r, comparison of how the design and construction processes for non-safety grade and safety grade commodities are handled for Midland. This information together with the information provided in the referenced letter should provide the Staff with the material requested during their review of the Midland Systems Interaction Program.
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. Please contact us if you have any questions related to the Midland Systems Interaction Program.
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- JGKeppler, Administrator, Region III DSHood, US NRC, Licensing Branch No 4
_MAMiller, US NRC, Licensing Branch No 4 DLQuamme, Midland e
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CONSUMERS POWER COMPANY Midland Units 1 and 2 Docket No 50-329, 50-330 Letter Serial 25506 Dated October 19, 1983 At the request of the Commission and pursuant to the Atomic Energy Act of 1954, and the Energy Reorganization Act of 1974, as amended and the Comission's Rules and Regulations thereunder, Consumers Power Company submits
-additional information on the Midland System Interactions Program.
CONSUMERS POWER COMPANY By-
)( R J Erhardt
' ExecutiW Manager-Hidland Project Sworn and subscribed before me this y of [ff /[8 4
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Jackson County, Michigan
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s ATS.CHMENT A
' PROCEDURES 1.
ATP-12-Q/01:. Procedure ~for performing-_ calculations and
' technical studies.
2.
WTP-4-Q/01:. Procedure for resolution of SSIP/S postulated interations.
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ATP-13-Q/01: Procedure for preparation-of project technical reports i
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ATTACHMENT B A~ COMPARISON OF DESIGN AND CONSTRUCTION PROCESSES, FOR SAFETY-GRADE AND NON-SAFETY GRADE STRUCTURES, SYSTEMS, AND COMPONENTS oc0883-1940b131-100
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.A COMPARISON OF DESIGN AND CONSTRUCTION PROCESSES
-FOR' SAFETY-GRADE AND NON-SAFETY GRADE STRUCTURES, SYSTEMS-AND COMPONENTS-This letter provides. additional information on selected topics covered at the-l
'JuneL14, 1983, meeting in' Washington,-DC on the Midland Systems-Interaction Program.
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i A -discussion developed concerning commodities. (eg,; pipe hangers) that were not
- safety related.- The confidence-level that could-be placed in such commodities
-that are'not inspected to the same extent as safety-related items was l questioned. zWould the pipe hanger in our example support the piping during a
-seismic' event?
t Historical, evidence has shown that most commodities in plants built using the unormal (non safety-related)' engineering and construction process survive and function after'a seismic event.' Examples include the Imperial Valley earthquake (October.15,1929) on the El: Centro Steam Plant in southern California; the offshore California earthquake (November 8, 1980) on the
. Humboldt Bay- (fossil). Power Plant, and -the Alarkan earthquake (March 27, 1964) on the Fort Richardson Central Heating and Power Plant.
In each of these j
cases,ano safety-related design or installation was used, yet the effects of i
the earthquake on these plants were minimal.
1 The. engineering ~and construction process for Q-and non-Q-listed systems and commodities is. identical except that Q-listed systems are seismically analyzed,1and Q-listed systems receive an additional quality verification by a
' separate group.
During the engineering. phase, a system is designed to applicable codes, standards,l and l criteria.' The design'is coordinated with appropriate Ldisciplines and checked for adequacy and accuracy..For-Q-listed systems, the design receives an additional quality verification check by a separate group.
During the' construction phase, the construction group builds a system in "accordance with the design documents or, where appropriate, has the' design documents revised and approved by engineering.
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Construction group activities that ensure. compliance with the design documents are' outlined below. Construction reviews the design for constructibility, material requirements, and special conditions, if any.
[If modifications are initiated by the construction group, the proposed changes are reviewed by engineering whether the proposed change is for a Q-or non-Q-listed system.. The only difference is that changes to Q-listed systems treceive=an additional quality verification check by a separate group.
. hen.the design is released and the materials are ordered, a systematic W
' approach'to proper construction and installation occurs. The availability of required materials is verified.
If the available material does not meet the-
- design requirements, a material field requisition is issued that details the oc0883-1940b131-100-
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2 t requirements',; quantities, storage requirements, purpose,' and use of the
- material. Once this material is_ received, it is checked against.these
. requirements to. verify that the material is adequate.
-Construction also prepares and issues field instructions and procedures as necessary, to. ensure that installation is accomplished within the design requirements'. Craft supervision then initiates installation in accordance with _the preplanned _ schedule' based on project engineering-approved designs, correct material availability, approved procedures,_and availability of-
. trained or qualified craft personnel.
Once the system has been completed, a. final. verification walkdown~by the
-construction group ensures that the system is installed in accordance with the design documents and that' drawings reflect as-built conditions. For Q-listed systems, there is~an additional quality verification walkdown by a separate group.
'Because of the similarity in the engineering and construction fo'r Q-and non-Q-listed systems and evidence that systems built to traditional (non-Q-listed) standards successfully survive significant seismic events, Consumers Power Company believes there is adequate assurance that failure of non-Q-listed commodities should not be of concern.
In addition, Consumers Power Company.
has a Q-listed program that reviews seismically induced spatial systems-
. interactions between Q-listed and non-Q-listed systems, and between different Q-listed systems. This. program provides an additional level of confidence that seismic movements and postulated failures of_non-Q-listed systems will net affect' the shutdown capability of the plant using Q-listed systems.
~For the above reasons, Consumers Power Company believes that the measures being taken by our company adequately address the support of non-Q-listed commodities during an earthquake.
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